Update app.py

app.py

@@ -221,8 +221,8 @@ class LangChain_Document_QA:
         response = chat_completion.choices[0].message.content
         
         if  ":" in response:
-          message = re.sub(r'^.*:', '', message)
-        history[-1][1] = message.strip()
+          response = re.sub(r'^.*:', '', response)
+        history[-1][1] = response.strip()
         history_state.value = history
         return history
       # except: