diff --git a/inference_video_parallel.py b/inference_video_parallel.py
index 00cdeaa..2ebf8b3 100644
--- a/inference_video_parallel.py
+++ b/inference_video_parallel.py
@@ -127,4 +127,5 @@ while success:
         buffer = []
 _thread.start_new_thread(clear_buffer, (args, buffer))
 pbar.close()
-vid_out.release()
+if not vid_out is None:
+    vid_out.release()