Update app.py

app.py

@@ -101,7 +101,7 @@ with gr.Blocks(css=".chatbox {height: 400px; overflow-y: auto; border: 1px solid
         return render_message(history), history, "", message  
 
     def regenerate_response(history, last_message, system_message, max_tokens, top_p, temperature):
-        return render_message(None), None
+        return "", []
 
     msg_input.submit(user_interaction, 
                      inputs=[msg_input, history_state, system_message, max_tokens, top_p, temperature],