Mintplex-Labs/anything-llm · error · Error

Image provider returned no image data.

Error message

Image provider returned no image data.

What it means

Thrown at the tail of requestImage when the generation result's data[0] has neither b64_json nor url. The provider returned a result (after safeJsonParse normalization for non-JSON content-types) but no recognizable image field exists. This guards against silently returning undefined when the provider's response shape does not match the OpenAI images schema.

Source

Thrown at server/utils/ImageGenerators/base.js:141

      },
      { signal: signal ?? undefined }
    );

    // Some OpenAI-compatible providers (e.g. Ollama) return the body with a
    // non-JSON content-type (`application/x-ndjson`), so the SDK hands back the
    // raw string unparsed. Normalize to an object before reading the image.
    const { safeJsonParse } = require("../http");
    const payload = typeof result === "string" ? safeJsonParse(result) : result;
    const image = payload?.data?.[0];
    if (image?.b64_json)
      return { buffer: Buffer.from(image.b64_json, "base64") };
    if (image?.url) {
      const res = await fetch(image.url, { signal: signal ?? null });
      if (!res.ok)
        throw new Error(`Failed to fetch generated image: ${res.status}`);
      return { buffer: Buffer.from(await res.arrayBuffer()) };
    }
    throw new Error("Image provider returned no image data.");
  }
}

module.exports = { BaseImageGenerator };

View on GitHub (pinned to 526360e320)

Solutions

1. Log the normalized payload (after safeJsonParse) right before the throw to inspect the actual shape.
2. Verify IMAGE_GEN_MODEL_PREF is an image-generation model, not a text model, on the provider.
3. If using Ollama, confirm the model supports the images.generate endpoint and returns valid JSON/ndjson.
4. Extend requestImage to handle the provider's custom envelope, or switch to a provider matching the OpenAI schema.

Example fix

// before
throw new Error('Image provider returned no image data.');

// after: capture the payload for debugging
console.error('[image-gen] unexpected payload:', JSON.stringify(payload));
throw new Error(`Image provider returned no image data. Got: ${JSON.stringify(payload?.data ?? payload).slice(0, 300)}`);

const { safeJsonParse } = require('../http');
function hasGeneratedImage(result) {
  const payload = typeof result === 'string' ? safeJsonParse(result) : result;
  const img = payload?.data?.[0];
  return !!(img && (img.b64_json || img.url));
}

/** @param {unknown} r */
function isGenerateResponse(r) {
  const p = typeof r === 'string' ? (() => { try { return JSON.parse(r); } catch { return null; } })() : r;
  const img = p && typeof p === 'object' && Array.isArray(p.data) ? p.data[0] : null;
  return !!img && typeof img === 'object' && (typeof img.b64_json === 'string' || typeof img.url === 'string');
}

try {
  return await generator.requestImage(prompt, size, signal);
} catch (e) {
  if (/Image provider returned no image data/.test(e.message)) {
    throw new Error('Provider returned no image — verify IMAGE_GEN_MODEL_PREF is an image model and check moderation');
  }
  throw e;
}

When it happens

Trigger: images.generate returns 200/OK with an empty data array, a data[0] containing only an error/revised_prompt/moderation field, a non-OpenAI envelope, or content filtering that suppressed the image. For Ollama/ndjson providers the result is string-parsed first, so a malformed JSON body also lands here.

Common situations: Content policy rejection returning 200 without an image; provider returning a different schema than {data:[{b64_json|url}]}; Ollama returning unparsable ndjson that safeJsonParse turns into a non-conforming object; a model that returns a text description instead of an image.

Related errors

• Image edit returned no image data.
• OpenRouter returned no image data.
• No Ollama image generation base path was set.
• No Ollama image generation model was set.
• Failed to fetch image

AI-assisted analysis of Mintplex-Labs/anything-llm@526360e320 (2026-08-13). Data as JSON: /api/errors/a36c46ebb8666d73. Report an issue: GitHub.