Update utils/llms.py

utils/llms.py

@@ -162,7 +162,7 @@ def gpt4stream(messages,model,api_keys):
         cunk=""
         for part in response:
             cunk=cunk+(part.choices[0].delta.content or "")
-            x=part.choices[0].delta.content
+            x=str(part.choices[0].delta.content) 
             x=x.replace('>','\n </think> \n ')
             if "```json" not in cunk:
                 helper.q.put_nowait(x or "")