diff --git a/bec_widgets/widgets/plots/waveform/waveform.py b/bec_widgets/widgets/plots/waveform/waveform.py
index 2d8e777e..fa98c01a 100644
--- a/bec_widgets/widgets/plots/waveform/waveform.py
+++ b/bec_widgets/widgets/plots/waveform/waveform.py
@@ -1191,7 +1191,7 @@ class Waveform(PlotBase):
         logger.info(f"Setup async curve {name}")
 
     @SafeSlot(dict, dict)
-    def on_async_readback(self, msg, metadata):
+    def on_async_readback(self, msg, metadata, skip_sender_validation: bool = False):
         """
         Get async data readback. This code needs to be fast, therefor we try
         to reduce the number of copies in between cycles. Be careful when refactoring
@@ -1208,6 +1208,7 @@ class Waveform(PlotBase):
         Args:
             msg(dict): Message with the async data.
             metadata(dict): Metadata of the message.
+            skip_sender_validation(bool): Skip sender validation. Used for testing. Default is False.
         """
         sender = self.sender()
         if sender and hasattr(sender, "cb_info"):
@@ -1216,9 +1217,10 @@ class Waveform(PlotBase):
                 logger.warning("Scan ID mismatch, ignoring async readback.")
                 return
             logger.info(f"Async readback for scan ID {scan_id}.")
-        else:
+        elif not skip_sender_validation:
             stack_trace = traceback.extract_stack()
             logger.warning(f"Async readback without scan ID, stack trace: {stack_trace}")
+            return
         instruction = metadata.get("async_update", {}).get("type")
         if instruction not in ["add", "add_slice", "replace"]:
             logger.warning(f"Invalid async update instruction: {instruction}")
diff --git a/tests/unit_tests/test_waveform_next_gen.py b/tests/unit_tests/test_waveform_next_gen.py
index 2aa934d7..e88fba7a 100644
--- a/tests/unit_tests/test_waveform_next_gen.py
+++ b/tests/unit_tests/test_waveform_next_gen.py
@@ -541,7 +541,7 @@ def test_on_async_readback_add_update(qtbot, mocked_client):
 
     msg = {"signals": {"async_device": {"value": [100, 200], "timestamp": [1001, 1002]}}}
     metadata = {"async_update": {"max_shape": [None], "type": "add"}}
-    wf.on_async_readback(msg, metadata)
+    wf.on_async_readback(msg, metadata, skip_sender_validation=True)
 
     x_data, y_data = c.get_data()
     assert len(x_data) == 5
@@ -553,7 +553,7 @@ def test_on_async_readback_add_update(qtbot, mocked_client):
     # instruction='replace'
     msg2 = {"signals": {"async_device": {"value": [999], "timestamp": [555]}}}
     metadata2 = {"async_update": {"max_shape": [None], "type": "replace"}}
-    wf.on_async_readback(msg2, metadata2)
+    wf.on_async_readback(msg2, metadata2, skip_sender_validation=True)
     x_data2, y_data2 = c.get_data()
     np.testing.assert_array_equal(x_data2, [0])
 
@@ -568,7 +568,7 @@ def test_on_async_readback_add_update(qtbot, mocked_client):
         metadata = {
             "async_update": {"max_shape": [None, waveform_shape], "index": 0, "type": "add_slice"}
         }
-        wf.on_async_readback(msg, metadata)
+        wf.on_async_readback(msg, metadata, skip_sender_validation=True)
 
     # Old data should be deleted since the slice_index did not match
     x_data, y_data = c.get_data()
@@ -595,7 +595,7 @@ def test_on_async_readback_add_update(qtbot, mocked_client):
         metadata = {
             "async_update": {"max_shape": [None, waveform_shape], "index": 0, "type": "add_slice"}
         }
-        wf.on_async_readback(msg, metadata)
+        wf.on_async_readback(msg, metadata, skip_sender_validation=True)
     x_data, y_data = c.get_data()
     assert len(y_data) == waveform_shape
     assert len(x_data) == waveform_shape
@@ -616,8 +616,7 @@ def test_on_async_readback_add_update(qtbot, mocked_client):
             }
         }
         metadata = {"async_update": {"type": "replace"}}
-        wf.on_async_readback(msg, metadata)
-
+        wf.on_async_readback(msg, metadata, skip_sender_validation=True)
     x_data, y_data = c.get_data()
     assert np.array_equal(y_data, np.array(range(waveform_shape)))
     assert len(x_data) == waveform_shape