Fix

app.py

@@ -22,6 +22,9 @@ print('Load detector.')
 detector = load_detector(config)
 
 def fn(video: gr.Video, actions: list[int]):
+  yield None, None
+  if video is None:
+    return
   print('Process video.')
   do_detect = 0 in actions
   do_classify = 1 in actions