diff --git a/pycromanager/acquisition/acq_eng_py/internal/engine.py b/pycromanager/acquisition/acq_eng_py/internal/engine.py
index 8fd24205..da02f57c 100644
--- a/pycromanager/acquisition/acq_eng_py/internal/engine.py
+++ b/pycromanager/acquisition/acq_eng_py/internal/engine.py
@@ -385,8 +385,9 @@ def acquire_images(self, event: AcquisitionEvent, hardware_sequences_in_progress
 
         self.stop_hardware_sequences(hardware_sequences_in_progress)
 
-        event.acquisition_.post_notification(AcqNotification(
-            AcqNotification.Camera, event.axisPositions_, AcqNotification.Camera.POST_SEQUENCE_STOPPED))
+        if event.get_sequence() is not None:
+            event.acquisition_.post_notification(AcqNotification(
+                AcqNotification.Camera, event.axisPositions_, AcqNotification.Camera.POST_SEQUENCE_STOPPED))
 
         if timeout:
             raise TimeoutError("Timeout waiting for images to arrive in circular buffer")
diff --git a/pycromanager/acquisition/acq_eng_py/main/acq_notification.py b/pycromanager/acquisition/acq_eng_py/main/acq_notification.py
index 75adc42a..e8b77457 100644
--- a/pycromanager/acquisition/acq_eng_py/main/acq_notification.py
+++ b/pycromanager/acquisition/acq_eng_py/main/acq_notification.py
@@ -46,8 +46,8 @@ def __init__(self, type, payload, milestone=None):
             self.type = AcqNotification.Image
             self.payload = payload
             self.milestone = milestone
-        elif milestone in [AcqNotification.Camera.PRE_SNAP, AcqNotification.Camera.POST_EXPOSURE,
-                     AcqNotification.Camera.PRE_SEQUENCE_STARTED]:
+        elif milestone in [AcqNotification.Camera.PRE_SNAP, AcqNotification.Camera.POST_SNAP,
+                     AcqNotification.Camera.PRE_SEQUENCE_STARTED, AcqNotification.Camera.POST_SEQUENCE_STOPPED]:
             self.type = AcqNotification.Camera
             self.payload = json.loads(payload) if isinstance(payload, str) else payload # convert from '{'time': 5}' to {'time': 5}
         elif milestone in [AcqNotification.Hardware.PRE_HARDWARE, AcqNotification.Hardware.POST_HARDWARE]: