Update app.py

app.py

@@ -102,6 +102,10 @@ def process_user_question(user_question):
         print('question is null')
         return
 
+     if st == None :
+        print('session is null')
+        return
+    
     response = st.session_state.conversation({'question': user_question})
     # response = st.session_state.conversation({'summarization': user_question})
     st.session_state.chat_history = response['chat_history']