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fix: guard against empty choices and message=None in LLM responses#39

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qizwiz:fix/guard-unguarded-llm-choices
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fix: guard against empty choices and message=None in LLM responses#39
qizwiz wants to merge 1 commit into
iMoonLab:mainfrom
qizwiz:fix/guard-unguarded-llm-choices

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@qizwiz qizwiz commented May 17, 2026

Problem

OpenAI-compatible APIs can fail in two ways that crash the evaluation pipeline:

  1. Empty choices list (IndexError): response.choices is [] when the API returns no completions
  2. message=None (AttributeError): response.choices[0].message is None when content is filtered (e.g., Gemini returns HTTP 200 with PROHIBITED_CONTENT, message=None)

Affected files

  • evaluate/evaluate_by_scoring.py — 1 site
  • evaluate/evaluate_by_selection.py — 1 site
  • reproduce/Step_2_extract_question.py — 1 site

3 total sites guarded. 6 lines added, 0 deleted.

Fix pattern

if not response.choices or response.choices[0].message is None:
    raise ValueError("LLM returned empty or filtered response")

Verification

Detected by pact static analysis. Confirmed live: Gemini 2.5 Flash returns HTTP 200 with choices[0].message=None on prohibited content.

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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