Update app.py

app.py

@@ -112,7 +112,7 @@ if prompt := st.chat_input("Do androids dream of electric sheep?"):
         st.write(prompt)
 
 # Generate a new response if last message is not from assistant
-if st.session_state.messages[-1]["role"] != "assistant":
+if len(st.session_state.messages) > 0 and st.session_state.messages[-1]["role"] != "assistant":
     with st.chat_message("assistant"):
         with st.spinner("Thinking..."):
             response = generate_fusechat_response()