Update app.py

app.py

@@ -191,17 +191,19 @@ def respond(message, history: list, system_message, max_tokens, temperature, top
     messages_list.append({"role": "user", "content": message})
     
     # Generate the assistant's answer by streaming responses.
-    response_text = ""
-    for partial_response in client.chat_completion(
-        messages_list,
-        max_tokens=max_tokens,
-        stream=True,
-        temperature=temperature,
-        top_p=top_p,
-    ):
+response_text = ""
+for partial_response in client.chat_completion(
+    messages_list,
+    max_tokens=max_tokens,
+    stream=True,
+    temperature=temperature,
+    top_p=top_p,
+):
+    if partial_response.choices and partial_response.choices[0].delta:
         token = partial_response.choices[0].delta.content
-        response_text += token
-        yield response_text
+        if token:
+            response_text += token
+            yield response_text
 
 # --- Gradio Chat Interface ---
 demo = gr.ChatInterface(