diff --git a/python_a2a/server/llm/openai.py b/python_a2a/server/llm/openai.py
index c8513e4..a2aceb8 100644
--- a/python_a2a/server/llm/openai.py
+++ b/python_a2a/server/llm/openai.py
@@ -564,7 +564,8 @@ async def stream_response(self, message: Message) -> AsyncGenerator[str, None]:
                 **kwargs
             ):
                 if (
-                    hasattr(chunk.choices[0].delta, "content")
+                    chunk.choices
+                    and hasattr(chunk.choices[0].delta, "content")
                     and chunk.choices[0].delta.content
                 ):
                     yield chunk.choices[0].delta.content