Update app.py

app.py

@@ -26,8 +26,10 @@ def chat_stream(messages):
     )
     
     for chunk in stream:
-        if chunk.choices[0].delta.content:
-            yield chunk.choices[0].delta.content
+        if chunk.choices and len(chunk.choices) > 0:
+            delta = chunk.choices[0].delta
+            if hasattr(delta, 'content') and delta.content:
+                yield delta.content
 
 def chat_respond(message, history):
     """
@@ -212,7 +214,7 @@ with gr.Blocks(fill_height=True) as demo:
     
     # Header Title
     gr.Markdown("""# GLM-4.7 CHAT""", elem_classes="header-text")
-    gr.Markdown("""<p class="subtitle">Zhipu AI's Latest Open Source Model - Powerful Reasoning & Coding Capabilities</p>""")
+    gr.Markdown("""<p class="subtitle">Zhipu AI's Latest Open Source Model - Powerful Reasoning and Coding Capabilities</p>""")
     
     # Model Info Box
     gr.HTML("""