fix by @treeaaa

whisperlivekit/audio_processor.py

@@ -638,6 +638,7 @@ class AudioProcessor:
 async def cleanup(self):
     """Clean up resources when processing is complete."""
     logger.info("Starting cleanup of AudioProcessor resources.")
+    self.is_stopping = True
     for task in self.all_tasks_for_cleanup:
         if task and not task.done():
             task.cancel()