diff --git a/server/entertainment_decider/models/entities.py b/server/entertainment_decider/models/entities.py
index 93c3427..2e5a302 100644
--- a/server/entertainment_decider/models/entities.py
+++ b/server/entertainment_decider/models/entities.py
@@ -611,7 +611,7 @@ class MediaThumbnail(db.Entity):
         res = requests.get(url=self.uri, headers=THUMBNAIL_HEADERS)
         mime = magic.from_buffer(res.content, mime=True)
         if mime not in THUMBNAIL_ALLOWED_TYPES:
-            return False
+            raise Exception(f"Couldn't download thumbnail: {thumbnail.uri}")
         self.mime_type = mime
         self.data = res.content
         self.last_downloaded = datetime.now()