fix: guard against empty choices and message=None in LLM responses#39
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yifanfeng97 merged 1 commit intoJun 27, 2026
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OpenAI-compatible APIs can return empty choices (IndexError) or choices[0].message=None on filtered content (HTTP 200, AttributeError). Adds guard before 3 bare choices[0].message.content accesses in evaluate/ and reproduce/ scripts. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Problem
OpenAI-compatible APIs can fail in two ways that crash the evaluation pipeline:
IndexError):response.choicesis[]when the API returns no completionsmessage=None(AttributeError):response.choices[0].messageisNonewhen content is filtered (e.g., Gemini returns HTTP 200 withPROHIBITED_CONTENT,message=None)Affected files
evaluate/evaluate_by_scoring.py— 1 siteevaluate/evaluate_by_selection.py— 1 sitereproduce/Step_2_extract_question.py— 1 site3 total sites guarded. 6 lines added, 0 deleted.
Fix pattern
Verification
Detected by pact static analysis. Confirmed live: Gemini 2.5 Flash returns HTTP 200 with
choices[0].message=Noneon prohibited content.