Update app.py

app.py

@@ -391,6 +391,10 @@ def process_youtube_video(url="", keywords=""):
         if not video_id:
             return thumbnail, "Invalid YouTube URL", sentiment_label, recommendations
 
+        video_id = extract_video_id(url)
+        if not video_id:
+            return thumbnail, "Invalid YouTube URL", sentiment_label, recommendations
+
         # Set thumbnail
         thumbnail = f"https://img.youtube.com/vi/{video_id}/maxresdefault.jpg"