Update app.py

app.py

@@ -670,7 +670,8 @@ if prompt :
         st.session_state["chat_started"] = True
         # Add user message to chat history
         st.session_state.chat_history.append({"role": "user", "content": prompt})
-        
+        response_placeholder = st.empty()
+
         # Display user message
         with st.chat_message("user"):
             st.markdown(prompt)