Update app.py

app.py

@@ -34,9 +34,13 @@ def chat_inf(system_prompt,prompt,history):
     formatted_prompt = format_prompt(f"{system_prompt}, {prompt}", history)
     stream = client.text_generation(formatted_prompt, **generate_kwargs, stream=True, details=True, return_full_text=False)
     output = ""
+        
     for response in stream:
         output += response.token.text
-        hist=[history,[prompt,output]]
+        if history:
+            hist=[history,(prompt,output)]
+        else:
+            hist=[(prompt,output)]
         yield hist