diff --git a/backend/src/routers/signvideo.py b/backend/src/routers/signvideo.py
index 2b7f480..8cf6849 100644
--- a/backend/src/routers/signvideo.py
+++ b/backend/src/routers/signvideo.py
@@ -102,6 +102,10 @@ async def sign_video_thumbnail(
     if not sign_video:
         raise BaseException("Sign video not found")
 
+    # check if the video exists
+    if not os.path.exists(f"{settings.DATA_PATH}/{sign_video.path}"):
+        raise BaseException("Video not found")
+
     # extract the thumbnail from the video
     bytes = extract_thumbnail(f"{settings.DATA_PATH}/{sign_video.path}")