Update app.py

app.py

@@ -166,6 +166,10 @@ add_paper_buttons_and_links()
 
 # Process user input is a post processor algorithm which runs after document embedding vector DB play of GPT on context of documents..
 def process_user_input(user_question):
+    # Check and initialize 'conversation' in session state if not present
+    if 'conversation' not in st.session_state:
+        st.session_state.conversation = {}  # Initialize with an empty dictionary or an appropriate default value
+
     response = st.session_state.conversation({'question': user_question})
     st.session_state.chat_history = response['chat_history']