Return 4 values from certificate not completed

app.py

@@ -153,7 +153,7 @@ async def handle_certificate(name, profile: gr.OAuthProfile):
     user_score = check_user_score(username)
 
     if not user_score:
-        return "You need to complete Unit 4 first.", None, None
+        return "You need to complete Unit 4 first.", None, None, None
 
     score = user_score["score"]