Update app.py

app.py

@@ -230,11 +230,13 @@ def save_conversation(chat_histories, session_id):
         st.error(f"Error during Git operations: {e}")
 
 # Combine chat histories from all pages
+def combine_chat_histories(all_chat_histories)
     all_chat_histories = [
-        st.session_state['chat_history_page1'],
-        st.session_state['chat_history_page2'],
-        st.session_state['chat_history_page3']
-    ]
+            st.session_state['chat_history_page1'],
+            st.session_state['chat_history_page2'],
+            st.session_state['chat_history_page3']
+        ]
+    return all_chat_histories
 
 def page1():
     try: