From 7e54b252166701cd9498fc85544bfa8961078b6c Mon Sep 17 00:00:00 2001
From: Jonathan Hill <jonathan.f.hill@gmail.com>
Date: Mon, 18 May 2026 04:05:41 -0500
Subject: [PATCH] fix: guard against empty/filtered LLM responses in OpenAI
 client

An empty choices list raises IndexError; a None message raises
AttributeError. Add a null check before accessing choices[0].message.
---
 ufo/llm/openai.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ufo/llm/openai.py b/ufo/llm/openai.py
index 613ee7b4..982d86d5 100644
--- a/ufo/llm/openai.py
+++ b/ufo/llm/openai.py
@@ -204,6 +204,8 @@ def _chat_completion(
                     completion_tokens,
                 )
 
+                if not response.choices or response.choices[0].message is None:
+                    raise ValueError("LLM returned empty or filtered response")
                 return [response.choices[0].message.content], cost
 
         except openai.APITimeoutError as e: