diff --git a/backend/llm.py b/backend/llm.py
index e541046..44f97e1 100644
--- a/backend/llm.py
+++ b/backend/llm.py
@@ -59,9 +59,10 @@ async def stream_openai_response(
     full_response = ""
     async for chunk in stream:  # type: ignore
         assert isinstance(chunk, ChatCompletionChunk)
-        content = chunk.choices[0].delta.content or ""
-        full_response += content
-        await callback(content)
+        if chunk.choices and chunk.choices[0].delta.content:
+            content = chunk.choices[0].delta.content or ""
+            full_response += content
+            await callback(content)
 
     await client.close()