diff --git a/qualle/__init__.py b/qualle/__init__.py
index 965d556..5a9d07a 100644
--- a/qualle/__init__.py
+++ b/qualle/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/evaluate.py b/qualle/evaluate.py
index 2ef6484..120537c 100644
--- a/qualle/evaluate.py
+++ b/qualle/evaluate.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/__init__.py b/qualle/features/__init__.py
index 965d556..5a9d07a 100644
--- a/qualle/features/__init__.py
+++ b/qualle/features/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/base.py b/qualle/features/base.py
index c642a74..dfcb876 100644
--- a/qualle/features/base.py
+++ b/qualle/features/base.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/combined.py b/qualle/features/combined.py
index 91dc1ad..4eb53b1 100644
--- a/qualle/features/combined.py
+++ b/qualle/features/combined.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/confidence.py b/qualle/features/confidence.py
index 8620a8e..16ad264 100644
--- a/qualle/features/confidence.py
+++ b/qualle/features/confidence.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/label_calibration/__init__.py b/qualle/features/label_calibration/__init__.py
index 965d556..5a9d07a 100644
--- a/qualle/features/label_calibration/__init__.py
+++ b/qualle/features/label_calibration/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/label_calibration/base.py b/qualle/features/label_calibration/base.py
index f287d79..7d9a7b2 100644
--- a/qualle/features/label_calibration/base.py
+++ b/qualle/features/label_calibration/base.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/label_calibration/simple_label_calibration.py b/qualle/features/label_calibration/simple_label_calibration.py
index 8ba955e..ab6bad6 100644
--- a/qualle/features/label_calibration/simple_label_calibration.py
+++ b/qualle/features/label_calibration/simple_label_calibration.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/label_calibration/thesauri_label_calibration.py b/qualle/features/label_calibration/thesauri_label_calibration.py
index 0a2d419..f0c7ca8 100644
--- a/qualle/features/label_calibration/thesauri_label_calibration.py
+++ b/qualle/features/label_calibration/thesauri_label_calibration.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/features/text.py b/qualle/features/text.py
index 37b81fa..8dd4d2b 100644
--- a/qualle/features/text.py
+++ b/qualle/features/text.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/interface/__init__.py b/qualle/interface/__init__.py
index 965d556..5a9d07a 100644
--- a/qualle/interface/__init__.py
+++ b/qualle/interface/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/interface/cli.py b/qualle/interface/cli.py
index 539864e..8d27d1b 100644
--- a/qualle/interface/cli.py
+++ b/qualle/interface/cli.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/interface/config.py b/qualle/interface/config.py
index 3840a18..a2ac044 100644
--- a/qualle/interface/config.py
+++ b/qualle/interface/config.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/interface/internal.py b/qualle/interface/internal.py
index 5da7c20..b6fe2c0 100644
--- a/qualle/interface/internal.py
+++ b/qualle/interface/internal.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/interface/rest.py b/qualle/interface/rest.py
index bf1a2b7..633c8ad 100644
--- a/qualle/interface/rest.py
+++ b/qualle/interface/rest.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/label_calibration/__init__.py b/qualle/label_calibration/__init__.py
index 965d556..5a9d07a 100644
--- a/qualle/label_calibration/__init__.py
+++ b/qualle/label_calibration/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/label_calibration/category.py b/qualle/label_calibration/category.py
index deaeb88..ef8ddcd 100644
--- a/qualle/label_calibration/category.py
+++ b/qualle/label_calibration/category.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/label_calibration/simple.py b/qualle/label_calibration/simple.py
index 66cde89..4d429a8 100644
--- a/qualle/label_calibration/simple.py
+++ b/qualle/label_calibration/simple.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/main.py b/qualle/main.py
index bdff148..79379d3 100644
--- a/qualle/main.py
+++ b/qualle/main.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/models.py b/qualle/models.py
index e346ace..ede2b44 100644
--- a/qualle/models.py
+++ b/qualle/models.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/pipeline.py b/qualle/pipeline.py
index 54967e6..74081c7 100644
--- a/qualle/pipeline.py
+++ b/qualle/pipeline.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -12,7 +12,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 from contextlib import contextmanager
-from typing import List, Callable, Any
+from typing import List, Callable, Any, Collection
 
 from sklearn.model_selection import cross_val_predict
 
@@ -65,15 +65,67 @@ def train(self, data: TrainData):
             self._recall_predictor.fit(features_data, true_recall)
 
     def predict(self, data: PredictData) -> List[float]:
-        predicted_no_of_labels = self._label_calibrator.predict(data.docs)
-        label_calibration_data = LabelCalibrationData(
-            predicted_labels=data.predicted_labels,
-            predicted_no_of_labels=predicted_no_of_labels
-        )
-        features_data = self._features_data_mapper(
-            data, label_calibration_data
+        zero_idxs = self._get_pdata_idxs_with_zero_labels(data)
+        data_with_labels = self._get_pdata_with_labels(data, zero_idxs)
+        if data_with_labels.docs:
+            predicted_no_of_labels = self._label_calibrator.predict(
+                data_with_labels.docs
+            )
+            label_calibration_data = LabelCalibrationData(
+                predicted_labels=data_with_labels.predicted_labels,
+                predicted_no_of_labels=predicted_no_of_labels,
+            )
+            features_data = self._features_data_mapper(
+                data_with_labels, label_calibration_data
+            )
+            predicted_recall = self._recall_predictor.predict(
+                features_data
+            )
+            recall_scores = self._merge_zero_recall_with_predicted_recall(
+                predicted_recall=predicted_recall,
+                zero_labels_idx=zero_idxs,
+            )
+        else:
+            recall_scores = [0] * len(data.predicted_labels)
+        return recall_scores
+
+    @staticmethod
+    def _get_pdata_idxs_with_zero_labels(data: PredictData) -> Collection[int]:
+        return [
+            i for i in range(len(data.predicted_labels))
+            if not data.predicted_labels[i]
+        ]
+
+    @staticmethod
+    def _get_pdata_with_labels(
+        data: PredictData, zero_labels_idxs: Collection[int]
+    ) -> PredictData:
+        non_zero_idxs = [
+            i for i in range(len(data.predicted_labels))
+            if i not in zero_labels_idxs
+        ]
+        return PredictData(
+            docs=[data.docs[i] for i in non_zero_idxs],
+            predicted_labels=[data.predicted_labels[i] for i in non_zero_idxs],
+            scores=[data.scores[i] for i in non_zero_idxs],
         )
-        return self._recall_predictor.predict(features_data)
+
+    @staticmethod
+    def _merge_zero_recall_with_predicted_recall(
+        predicted_recall: List[float],
+        zero_labels_idx: Collection[int],
+    ):
+        recall_scores = []
+        j = 0
+        for i in range(
+                len(zero_labels_idx) +
+                len(predicted_recall)):
+            if i in zero_labels_idx:
+                recall_scores.append(0)
+            else:
+                recall_scores.append(predicted_recall[j])
+                j += 1
+        return recall_scores
 
     @contextmanager
     def _debug(self, method_name):
diff --git a/qualle/quality_estimation.py b/qualle/quality_estimation.py
index 99c92c7..26828b4 100644
--- a/qualle/quality_estimation.py
+++ b/qualle/quality_estimation.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/train.py b/qualle/train.py
index 77670ea..505918e 100644
--- a/qualle/train.py
+++ b/qualle/train.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/qualle/utils.py b/qualle/utils.py
index f0e1d41..66173f4 100644
--- a/qualle/utils.py
+++ b/qualle/utils.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/__init__.py b/tests/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/common.py b/tests/common.py
index 4288dbd..0a04d8f 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/conftest.py b/tests/conftest.py
index a4c783b..0da8bd0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/__init__.py b/tests/features/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/features/__init__.py
+++ b/tests/features/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/__init__.py b/tests/features/label_calibration/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/features/label_calibration/__init__.py
+++ b/tests/features/label_calibration/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_simple_label_calibration/__init__.py b/tests/features/label_calibration/test_simple_label_calibration/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/features/label_calibration/test_simple_label_calibration/__init__.py
+++ b/tests/features/label_calibration/test_simple_label_calibration/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_simple_label_calibration/test_calibrator.py b/tests/features/label_calibration/test_simple_label_calibration/test_calibrator.py
index 56e8083..269f617 100644
--- a/tests/features/label_calibration/test_simple_label_calibration/test_calibrator.py
+++ b/tests/features/label_calibration/test_simple_label_calibration/test_calibrator.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_simple_label_calibration/test_features.py b/tests/features/label_calibration/test_simple_label_calibration/test_features.py
index 42c413d..8535012 100644
--- a/tests/features/label_calibration/test_simple_label_calibration/test_features.py
+++ b/tests/features/label_calibration/test_simple_label_calibration/test_features.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_thesauri_label_calibration/__init__.py b/tests/features/label_calibration/test_thesauri_label_calibration/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/features/label_calibration/test_thesauri_label_calibration/__init__.py
+++ b/tests/features/label_calibration/test_thesauri_label_calibration/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_thesauri_label_calibration/common.py b/tests/features/label_calibration/test_thesauri_label_calibration/common.py
index 8ea1f57..2c968f1 100644
--- a/tests/features/label_calibration/test_thesauri_label_calibration/common.py
+++ b/tests/features/label_calibration/test_thesauri_label_calibration/common.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_thesauri_label_calibration/conftest.py b/tests/features/label_calibration/test_thesauri_label_calibration/conftest.py
index c29652c..22277c3 100644
--- a/tests/features/label_calibration/test_thesauri_label_calibration/conftest.py
+++ b/tests/features/label_calibration/test_thesauri_label_calibration/conftest.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_thesauri_label_calibration/test_calibrator.py b/tests/features/label_calibration/test_thesauri_label_calibration/test_calibrator.py
index e064c25..76bb955 100644
--- a/tests/features/label_calibration/test_thesauri_label_calibration/test_calibrator.py
+++ b/tests/features/label_calibration/test_thesauri_label_calibration/test_calibrator.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_thesauri_label_calibration/test_features.py b/tests/features/label_calibration/test_thesauri_label_calibration/test_features.py
index 3782fa1..db6e322 100644
--- a/tests/features/label_calibration/test_thesauri_label_calibration/test_features.py
+++ b/tests/features/label_calibration/test_thesauri_label_calibration/test_features.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/label_calibration/test_thesauri_label_calibration/test_transformer.py b/tests/features/label_calibration/test_thesauri_label_calibration/test_transformer.py
index 23bfb3f..b62ca74 100644
--- a/tests/features/label_calibration/test_thesauri_label_calibration/test_transformer.py
+++ b/tests/features/label_calibration/test_thesauri_label_calibration/test_transformer.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/test_combined.py b/tests/features/test_combined.py
index 11c7c62..5df330e 100644
--- a/tests/features/test_combined.py
+++ b/tests/features/test_combined.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/test_confidence.py b/tests/features/test_confidence.py
index 1b68bc7..a4159fa 100644
--- a/tests/features/test_confidence.py
+++ b/tests/features/test_confidence.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/features/test_text.py b/tests/features/test_text.py
index ad3f3a3..ab60ef9 100644
--- a/tests/features/test_text.py
+++ b/tests/features/test_text.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/interface/__init__.py b/tests/interface/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/interface/__init__.py
+++ b/tests/interface/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/interface/common.py b/tests/interface/common.py
index c4bbab3..31d6cea 100644
--- a/tests/interface/common.py
+++ b/tests/interface/common.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/interface/test_cli.py b/tests/interface/test_cli.py
index 9d3f722..cf923b9 100644
--- a/tests/interface/test_cli.py
+++ b/tests/interface/test_cli.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/interface/test_internal.py b/tests/interface/test_internal.py
index faa37b6..f7040a2 100644
--- a/tests/interface/test_internal.py
+++ b/tests/interface/test_internal.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/interface/test_rest.py b/tests/interface/test_rest.py
index db21107..d925613 100644
--- a/tests/interface/test_rest.py
+++ b/tests/interface/test_rest.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/label_calibration/__init__.py b/tests/label_calibration/__init__.py
index 965d556..5a9d07a 100644
--- a/tests/label_calibration/__init__.py
+++ b/tests/label_calibration/__init__.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/label_calibration/conftest.py b/tests/label_calibration/conftest.py
index 030edaa..c3d2415 100644
--- a/tests/label_calibration/conftest.py
+++ b/tests/label_calibration/conftest.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/label_calibration/test_category.py b/tests/label_calibration/test_category.py
index 5bd4354..b8259e7 100644
--- a/tests/label_calibration/test_category.py
+++ b/tests/label_calibration/test_category.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/label_calibration/test_simple.py b/tests/label_calibration/test_simple.py
index 8674b3a..19b3b6c 100644
--- a/tests/label_calibration/test_simple.py
+++ b/tests/label_calibration/test_simple.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/test_eval.py b/tests/test_eval.py
index a45fce0..abe296a 100644
--- a/tests/test_eval.py
+++ b/tests/test_eval.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/test_integration.py b/tests/test_integration.py
index 07ca830..b428bdc 100644
--- a/tests/test_integration.py
+++ b/tests/test_integration.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/test_pipeline.py b/tests/test_pipeline.py
index 2fe3550..3e282c2 100644
--- a/tests/test_pipeline.py
+++ b/tests/test_pipeline.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -58,6 +58,20 @@ def train_data():
     )
 
 
+@pytest.fixture
+def train_data_with_some_empty_labels(train_data):
+    train_data.predict_data.predicted_labels = [['c'], [], ['c'], [], ['c']]
+
+    return train_data
+
+
+@pytest.fixture
+def train_data_with_all_empty_labels(train_data):
+    train_data.predict_data.predicted_labels = [[]] * 5
+
+    return train_data
+
+
 def test_train(qp, train_data, mocker):
     calibrator = qp._label_calibrator
     mocker.spy(calibrator, 'fit')
@@ -99,6 +113,24 @@ def test_predict(qp, train_data):
     assert np.array_equal(qp.predict(p_data), [1] * 5)
 
 
+def test_predict_with_some_empty_labels_returns_zero_recall(
+        qp, train_data_with_some_empty_labels):
+    p_data = train_data_with_some_empty_labels.predict_data
+
+    qp.train(train_data_with_some_empty_labels)
+
+    assert np.array_equal(qp.predict(p_data), [1, 0, 1, 0, 1])
+
+
+def test_predict_with_all_empty_labels_returns_only_zero_recall(
+        qp, train_data_with_all_empty_labels):
+    p_data = train_data_with_all_empty_labels.predict_data
+
+    qp.train(train_data_with_all_empty_labels)
+
+    assert np.array_equal(qp.predict(p_data), [0] * 5)
+
+
 def test_debug_prints_time_if_activated(qp, caplog):
     qp._should_debug = True
     caplog.set_level(logging.DEBUG)
diff --git a/tests/test_qe.py b/tests/test_qe.py
index bcf51b8..baf7cc0 100644
--- a/tests/test_qe.py
+++ b/tests/test_qe.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/test_train.py b/tests/test_train.py
index 3c8eb5f..aa5af5a 100644
--- a/tests/test_train.py
+++ b/tests/test_train.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
diff --git a/tests/test_utils.py b/tests/test_utils.py
index d28ca67..aee0a6b 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,4 +1,4 @@
-#  Copyright 2021 ZBW – Leibniz Information Centre for Economics
+#  Copyright 2021-2022 ZBW – Leibniz Information Centre for Economics
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.