Update app.py

app.py

@@ -109,6 +109,6 @@ if prompt := st.chat_input("How can I help?"):
     with st.chat_message("assistant", avatar=BOT_AVATAR):
         message_placeholder = st.empty()
         full_response = chain.invoke(prompt)['result']
-        message_placeholder.markdown(chain.invoke(prompt)['result'])
+        message_placeholder.markdown(full_response)
         st.session_state.messages.append({"role": "assistant", "content": full_response})
 save_chat_history(st.session_state.messages)