Update app.py

app.py

@@ -28,9 +28,10 @@ for msg in message_history:
 placeholder = st.empty()  # placeholder for latest message
 
 with placeholder.container():
-    if message_history[-1] != "":
+    last_message = message_history[-1]
+    if last_message != "":
     
-        message(message_history[-1]["text"], message_history[-1]["is_user"]) # display the latest message
+        message(last_message["text"], last_message["is_user"]) # display the latest message
         
 input = st.text_input("Ask me 🤗")
 message(input, is_user=True)  # align's the message to the right