Update app.py

app.py

@@ -76,9 +76,10 @@ def respond(message, history, system_message, max_tokens, temperature, top_p):
         temperature=temperature,
         top_p=top_p,
     ):
-        token = message.choices[0].delta.content
-        response += token
-        yield response
+        if message.choices and message.choices[0].delta and message.choices[0].delta.content:
+            token = message.choices[0].delta.content
+            response += token
+            yield response
 
 demo = gr.ChatInterface(
     respond,