diff --git a/orangecontrib/spectroscopy/tests/test_owhyper.py b/orangecontrib/spectroscopy/tests/test_owhyper.py
index 1ca23cb76..3d9825216 100644
--- a/orangecontrib/spectroscopy/tests/test_owhyper.py
+++ b/orangecontrib/spectroscopy/tests/test_owhyper.py
@@ -386,12 +386,14 @@ def test_unknown_values_axes(self):
         self.assertTrue(self.widget.Information.not_shown.is_shown())
 
     def test_migrate_context_feature_color(self):
-        c = self.widget.settingsHandler.new_context(self.iris.domain,
-                                                    None, self.iris.domain.class_vars)
+        # avoid class_vars in tests, because the setting does not allow them
+        iris = self.iris.transform(
+            Domain(self.iris.domain.attributes, None, self.iris.domain.class_vars))
+        c = self.widget.settingsHandler.new_context(iris.domain, None, iris.domain.metas)
         c.values["curveplot"] = {"feature_color": ("iris", 1)}
         self.widget = self.create_widget(OWHyper,
                                          stored_settings={"context_settings": [c]})
-        self.send_signal("Data", self.iris)
+        self.send_signal("Data", iris)
         self.assertIsInstance(self.widget.curveplot.feature_color, DiscreteVariable)
 
     def test_image_computation(self):
diff --git a/orangecontrib/spectroscopy/tests/test_owspectra.py b/orangecontrib/spectroscopy/tests/test_owspectra.py
index 3b9939768..5c1020c04 100644
--- a/orangecontrib/spectroscopy/tests/test_owspectra.py
+++ b/orangecontrib/spectroscopy/tests/test_owspectra.py
@@ -569,12 +569,14 @@ def test_waterfall(self):
         self.assertTrue(vb.targetRect().bottom() > 800)
 
     def test_migrate_context_feature_color(self):
-        c = self.widget.settingsHandler.new_context(self.iris.domain,
-                                                    None, self.iris.domain.class_vars)
+        # avoid class_vars in tests, because the setting does not allow them
+        iris = self.iris.transform(
+            Domain(self.iris.domain.attributes, None, self.iris.domain.class_vars))
+        c = self.widget.settingsHandler.new_context(iris.domain, None, iris.domain.metas)
         c.values["curveplot"] = {"feature_color": ("iris", 1)}
         self.widget = self.create_widget(OWSpectra,
                                          stored_settings={"context_settings": [c]})
-        self.send_signal("Data", self.iris)
+        self.send_signal("Data", iris)
         self.assertIsInstance(self.widget.curveplot.feature_color, DiscreteVariable)
 
     def test_compat_no_group(self):
diff --git a/orangecontrib/spectroscopy/widgets/owbin.py b/orangecontrib/spectroscopy/widgets/owbin.py
index 04d758fe3..e31f9eb35 100644
--- a/orangecontrib/spectroscopy/widgets/owbin.py
+++ b/orangecontrib/spectroscopy/widgets/owbin.py
@@ -46,7 +46,7 @@ class Warning(OWWidget.Warning):
 
     settingsHandler = DomainContextHandler()
 
-    attrs = ContextSetting([None, None])
+    attrs = ContextSetting([None, None], exclude_attributes=True)
     bin_shape = settings.Setting((1, 1))
     square_bin = settings.Setting(True)
 
diff --git a/orangecontrib/spectroscopy/widgets/owhyper.py b/orangecontrib/spectroscopy/widgets/owhyper.py
index 6118e6be1..9f9f83182 100644
--- a/orangecontrib/spectroscopy/widgets/owhyper.py
+++ b/orangecontrib/spectroscopy/widgets/owhyper.py
@@ -623,8 +623,8 @@ class ImagePlot(QWidget, OWComponent, SelectionGroupMixin,
                 ImageColorSettingMixin, ImageRGBSettingMixin,
                 ImageZoomMixin, ConcurrentMixin):
 
-    attr_x = ContextSetting(None)
-    attr_y = ContextSetting(None)
+    attr_x = ContextSetting(None, exclude_attributes=True)
+    attr_y = ContextSetting(None, exclude_attributes=True)
     gamma = Setting(0)
 
     selection_changed = Signal()
diff --git a/orangecontrib/spectroscopy/widgets/owsnr.py b/orangecontrib/spectroscopy/widgets/owsnr.py
index 93ece6028..4fae53f95 100644
--- a/orangecontrib/spectroscopy/widgets/owsnr.py
+++ b/orangecontrib/spectroscopy/widgets/owsnr.py
@@ -31,8 +31,10 @@ class Outputs:
                    'Standard Deviation': 2} # std
 
     settingsHandler = settings.DomainContextHandler()
-    group_x = settings.ContextSetting(None)
-    group_y = settings.ContextSetting(None)
+    group_x = settings.ContextSetting(None, exclude_attributes=True,
+                                      exclude_class_vars=True)
+    group_y = settings.ContextSetting(None, exclude_attributes=True,
+                                      exclude_class_vars=True)
     out_choiced = settings.Setting(0)
 
     autocommit = settings.Setting(True)
diff --git a/orangecontrib/spectroscopy/widgets/owspectra.py b/orangecontrib/spectroscopy/widgets/owspectra.py
index 1db4a7a5a..0aef622a6 100644
--- a/orangecontrib/spectroscopy/widgets/owspectra.py
+++ b/orangecontrib/spectroscopy/widgets/owspectra.py
@@ -892,7 +892,7 @@ class CurvePlot(QWidget, OWComponent, SelectionGroupMixin):
 
     sample_seed = Setting(0, schema_only=True)
     peak_labels_saved = Setting([], schema_only=True)
-    feature_color = ContextSetting(None)
+    feature_color = ContextSetting(None, exclude_attributes=True)
     color_individual = Setting(False)  # color individual curves (in a cycle) if no feature_color
     invertX = Setting(False)
     viewtype = Setting(INDIVIDUAL)
diff --git a/orangecontrib/spectroscopy/widgets/owspectralseries.py b/orangecontrib/spectroscopy/widgets/owspectralseries.py
index 3f05b6a85..ddca47c45 100644
--- a/orangecontrib/spectroscopy/widgets/owspectralseries.py
+++ b/orangecontrib/spectroscopy/widgets/owspectralseries.py
@@ -33,7 +33,7 @@
 class LineScanPlot(QWidget, OWComponent, SelectionGroupMixin,
                    ImageColorSettingMixin, ImageZoomMixin):
 
-    attr_x = ContextSetting(None)
+    attr_x = ContextSetting(None, exclude_attributes=True)
     gamma = Setting(0)
 
     selection_changed = Signal()
diff --git a/orangecontrib/spectroscopy/widgets/owstackalign.py b/orangecontrib/spectroscopy/widgets/owstackalign.py
index fad8ab873..dadda5acb 100644
--- a/orangecontrib/spectroscopy/widgets/owstackalign.py
+++ b/orangecontrib/spectroscopy/widgets/owstackalign.py
@@ -141,8 +141,8 @@ class Error(OWWidget.Error):
     settingsHandler = DomainContextHandler()
 
     sobel_filter = settings.Setting(False)
-    attr_x = ContextSetting(None)
-    attr_y = ContextSetting(None)
+    attr_x = ContextSetting(None, exclude_attributes=True)
+    attr_y = ContextSetting(None, exclude_attributes=True)
     ref_frame_num = settings.Setting(0)
 
     def __init__(self):