Update app.py

app.py

@@ -113,7 +113,7 @@ def chat_query_doc(question, chat_history_doc):
     llm_chain = qa_prompt | llm
         
     qa_chain = ConversationalRetrievalChain.from_llm(
-        llm_chain,
+        llm,
         retriever = retriever, 
         return_source_documents = True
     )