Update app.py

app.py

@@ -41,7 +41,7 @@ def chat_inf(system_prompt,prompt,history):
     for response in stream:
         output += response.token.text
         if history:
-            history[hist_len+1]=[(prompt,output)]
+            history[-1]=[(prompt,output)]
             hist=history
             #hist=[history,(prompt,output)]
         else: