diff --git a/src/pipecat/services/openai.py b/src/pipecat/services/openai.py
index 19c8f6d99..1c3977b7f 100644
--- a/src/pipecat/services/openai.py
+++ b/src/pipecat/services/openai.py
@@ -221,7 +221,7 @@ class BaseOpenAILLMService(LLMService):
                 )
                 await self.start_llm_usage_metrics(tokens)
 
-            if len(chunk.choices) == 0:
+            if chunk.choices is None or len(chunk.choices) == 0:
                 continue
 
             await self.stop_ttfb_metrics()