diff --git a/querent/callback/event_callback_dispatcher.py b/querent/callback/event_callback_dispatcher.py
index 663cb38c..b22992f4 100644
--- a/querent/callback/event_callback_dispatcher.py
+++ b/querent/callback/event_callback_dispatcher.py
@@ -32,7 +32,7 @@ async def dispatch_event(self, event_type: EventType, event_data: EventState):
             event_data (Any): Data associated with the event.
         """
         for callback in self.callbacks[event_type]:
-            await callback.handle_event(event_type, event_data)
+            callback.handle_event(event_type, event_data)
 
     def register_webhook(self, event_type: EventType, webhook: str):
         """
diff --git a/querent/callback/event_callback_interface.py b/querent/callback/event_callback_interface.py
index 78e8c2f9..1034efac 100644
--- a/querent/callback/event_callback_interface.py
+++ b/querent/callback/event_callback_interface.py
@@ -8,9 +8,8 @@
 
 
 class EventCallbackInterface(ABC):
-
     @abstractmethod
-    async def handle_event(self, event_type: EventType, event_data: EventState):
+    def handle_event(self, event_type: EventType, event_data: EventState):
         """
         Handle an event.
         Args:
diff --git a/tests/data/pdf2/dummy.pdf b/tests/data/pdf2/dummy.pdf
new file mode 100644
index 00000000..774c2ea7
Binary files /dev/null and b/tests/data/pdf2/dummy.pdf differ
diff --git a/tests/data/pdf3/dummy.pdf b/tests/data/pdf3/dummy.pdf
new file mode 100644
index 00000000..dbf091df
Binary files /dev/null and b/tests/data/pdf3/dummy.pdf differ
diff --git a/tests/test-fanning-in-collectors.py b/tests/test-fanning-in-collectors.py
new file mode 100644
index 00000000..b5da8612
--- /dev/null
+++ b/tests/test-fanning-in-collectors.py
@@ -0,0 +1,70 @@
+import asyncio
+from pathlib import Path
+from querent.collectors.fs.fs_collector import FSCollectorFactory
+from querent.config.collector_config import FSCollectorConfig
+from querent.common.uri import Uri
+from querent.ingestors.ingestor_manager import IngestorFactoryManager
+import pytest
+import uuid
+
+count = 0
+
+
+@pytest.mark.asyncio
+async def test_collect_and_ingest_pdf():
+    # Set up the collector
+    output_queue = asyncio.Queue()
+    logger_queue = asyncio.Queue()
+    stop_event = asyncio.Event()
+    directories = ["./tests/data/pdf/", "./tests/data/pdf2/", "./tests/data/pdf3/"]
+    workers = [
+        create_workers(i, output_queue, logger_queue, stop_event) for i in directories
+    ]
+
+    # stop_event_tasks = asyncio.create_task(stop_workers(logger_queue, stop_event))
+    queue_tasks = asyncio.create_task(see_contents(output_queue))
+    asyncio.gather(*workers)
+    await output_queue.join()
+    await queue_tasks
+
+
+async def see_contents(output_queue):
+    while True:
+        data = await output_queue.get()
+        if data == "DONE":
+            global count
+            count = count + 1
+        if count == 3:
+            break
+        else:
+            output_queue.task_done()
+            print(data)
+
+
+async def create_workers(directory, output_queue, logger_queue, stop_event):
+    try:
+        collector_factory = FSCollectorFactory()
+        uri = Uri("file://" + str(Path(directory).resolve()))
+        config = FSCollectorConfig(root_path=uri.path, id=str(uuid.uuid4()))
+        collector = collector_factory.resolve(uri, config)
+        ingestor_factory_manager = IngestorFactoryManager()
+        ingestor_factory = await ingestor_factory_manager.get_factory("pdf")
+        ingestor = await ingestor_factory.create("pdf", [])
+        ingested_call = ingestor.ingest(collector.poll())
+        async for ingested in ingested_call:
+            if ingested.data is None:
+                # continue
+                await logger_queue.put("1 file received")
+                print("Putting 1 file in logger queue")
+            else:
+                await output_queue.put(ingested.data)
+    except Exception as e:
+        print("Got an exception:  ", e)
+
+    finally:
+        # Always ensure we send the "DONE" signal, even if an exception occurred
+        await output_queue.put("DONE")
+
+
+if __name__ == "__main__":
+    asyncio.run(test_collect_and_ingest_pdf())