diff --git a/app.py b/app.py
index 399dff0..1577f6c 100644
--- a/app.py
+++ b/app.py
@@ -299,6 +299,11 @@ def proxy(video_id):
         logger.error(f"Failed to retrieve data for video ID '{video_id}'")
         return Response("Video not found", status=404)
 
+    reason_code = params.get('reasonCode', '').upper()
+    if reason_code in ['HIDDEN_VIDEO']:
+        logger.warning(f"Video ID '{video_id}' is hidden")
+        return Response("Video not found", status=404)
+
     thumbnail_url = (
         params["video"]["thumbnail"].get("ogp") or
         params["video"]["thumbnail"].get("player") or