diff --git a/sharp_frame_extractor/__main__.py b/sharp_frame_extractor/__main__.py
index d1f08dc..e5174e6 100644
--- a/sharp_frame_extractor/__main__.py
+++ b/sharp_frame_extractor/__main__.py
@@ -82,6 +82,7 @@ def on_task_finished(future: Future[FrameAnalyzerResult]):
             output_file_name.unlink(missing_ok=True)
 
         cv2.imwrite(str(output_file_name.absolute()), result.frame)
+        result.frame = None
         progress.update(task_id, advance=1)
 
     # start reading video file