Update app.py

app.py

@@ -196,7 +196,10 @@ with gr.Blocks() as demo:
         upvote_btn_a.click(vote_up_model, inputs=[state, chatbot1,chatbot2], outputs=[chatbot1,chatbot2,upvote_btn_a,upvote_btn_b,textbox,submit_btn])
         upvote_btn_b.click(vote_down_model, inputs=[state, chatbot1,chatbot2], outputs=[chatbot1,chatbot2,upvote_btn_a,upvote_btn_b,textbox,submit_btn])
     with gr.Tab("Leaderboard"):
-        leaderboard = gr.Dataframe(refresh_leaderboard())
+        try:
+            leaderboard = gr.Dataframe(refresh_leaderboard())
+        except:
+            leaderboard=gr.Dataframe()
         refresh_btn = gr.Button("Refresh Leaderboard")
 
     # Function to refresh leaderboard