jackwener/OpenCLI · error · CommandExecutionError

Gemini image detection returned a malformed result

Error message

Gemini image detection returned a malformed result

What it means

Thrown when the image-detection page.evaluate returns a non-array (caught by requireGeminiArrayResult with label 'Gemini image detection') or an array containing non-string URLs. The library extracts generated-image URLs from the response DOM and validates the shape before returning them to callers like waitForGeminiImages.

Source

Thrown at clis/gemini/utils.js:2367

        const width = img.naturalWidth || img.width || 0;
        const height = img.naturalHeight || img.height || 0;
        if (!src) continue;
        if (alt.includes('avatar') || alt.includes('logo') || alt.includes('icon')) continue;
        // A placeholder still streaming its bytes reports complete false and
        // naturalWidth 0 while laying out at full size, so the size gate below
        // would accept it and the export step would save a blank frame (#2245).
        if (!img.complete || !img.naturalWidth) continue;
        if (width < 128 && height < 128) continue;
        if (seen.has(src)) continue;
        seen.add(src);
        urls.push(src);
      }
      return urls;
    })()
  `);
    const urls = requireGeminiArrayResult(result, 'Gemini image detection');
    if (!urls.every((url) => typeof url === 'string')) {
        throw new CommandExecutionError('Gemini image detection returned a malformed result');
    }
    return urls;
}
/** Cheap generation probe: the snapshot read walks the whole transcript. */
export async function isGeminiGenerating(page) {
    let result;
    try {
        result = await page.evaluate(`(() => ${isGeneratingExpression()})()`);
    }
    catch (error) {
        const message = error instanceof Error ? error.message : String(error);
        throw new CommandExecutionError('Gemini generation probe failed', message);
    }
    const value = unwrapGeminiEvaluateResult(result, 'Gemini generation probe');
    if (typeof value !== 'boolean') {
        throw new CommandExecutionError('Gemini generation probe returned a malformed result');
    }
    return value;

View on GitHub (pinned to 49907e53dc)

Solutions

1. Wait until the assistant response has fully rendered before extracting images (use waitForGeminiTranscript first).
2. Log the raw evaluate result and update the image-extraction script selectors to the current Gemini image DOM.
3. Coerce entries to strings (img.src) and filter nulls inside the in-page script.
4. Catch CommandExecutionError and treat as 'no images yet', retrying with the existing poll loop.

function isImageUrlArray(v) {
  return Array.isArray(v) && v.every((u) => typeof u === 'string' && /^https?:|^data:|^blob:/.test(u));
}

try {
  urls = await getGeminiImageUrls(page);
} catch (e) {
  if (String(e.message).includes('malformed result')) urls = []; // no images yet
  else throw e;
}

When it happens

Trigger: Calling image extraction/waitForGeminiImages when the in-page script returns undefined/null instead of an array (script error, no conversation DOM) or rows that are objects/null instead of URL strings — usually because Gemini changed how generated images are embedded (new container, blob URLs, srcset).

Common situations: Gemini UI update to image carousels; page polled before any response rendered; conversation using an image format the extractor doesn't recognize; evaluate unwrapping producing undefined on script exception.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

Related errors

• Gemini conversation list returned a malformed row
• Gemini visible turns returned a malformed row
• Gemini model discovery returned a malformed row
• Gemini transcript lines returned a malformed row
• Gemini page snapshot returned a malformed result

AI-assisted analysis of jackwener/OpenCLI@49907e53dc (2026-08-29). Data as JSON: /api/errors/50ec546141d05ef5. Report an issue: GitHub.