Update app.py

app.py

@@ -959,7 +959,7 @@ with gr.Blocks() as block:
             clear = gr.ClearButton([msg, chatbot])
 
             def user(user_message, history):
-                return "", [[user_message, None]]
+                return "", history + [[user_message, None]]
             
             def bot(history, chat_engine):
                 print(chat_engine)