diff --git a/web/src/lib/ffmpeg.ts b/web/src/lib/ffmpeg.ts
index c5536629..7f677105 100644
--- a/web/src/lib/ffmpeg.ts
+++ b/web/src/lib/ffmpeg.ts
@@ -87,6 +87,7 @@ export default class FFmpegWrapper {
             { type: output.type }
         );
 
+        if (renderBlob.size === 0) return;
         return renderBlob;
     }
 }