Update app.py

app.py

@@ -163,7 +163,7 @@ graph = builder.compile()
 st.set_page_config(page_title="Math Chatbot",layout="centered")
 st.title("Math Chatbot")
 
-for msg in st.session_session.chat_history:
+for msg in st.session_state.chat_history:
     with st.chat_message(msg["role"]):
         st.markdown(msg["content"])