Update app.py

app.py

@@ -82,11 +82,11 @@ def main(vectorstore):
         msgs = st.session_state.get("chat_history", StreamlitChatMessageHistory(key="special_app_key"))
         st.chat_message("human").write(prompt)
 
-        if st.session_state.conversation_chain is not None:
-            input_dict = {"input": prompt, "chat_history": msgs.messages}
-            config = {"configurable": {"session_id": "any"}}
-            response = st.session_state.conversation_chain.invoke(input_dict, config)
-            st.chat_message("ai").write(response["answer"])
+        conversation_chain = create_conversational_rag_chain()
+        input_dict = {"input": prompt, "chat_history": msgs.messages}
+        config = {"configurable": {"session_id": "any"}}
+        response = conversation_chain.invoke(input_dict, config)
+        st.chat_message("ai").write(response["answer"])
 
             if "docs" in response and response["documents"]:
                 for index, doc in enumerate(response["documents"]):