Comfy-Org/ComfyUI · error · RuntimeError

Luma API did not return a generation id.

Error message

Luma API did not return a generation id.

What it means

Raised by _luma2_submit_and_poll (comfy_api_nodes/nodes_luma.py:713) when a POST to /proxy/luma_2/generations returns 2xx but the response model has no id. Without an id the node cannot poll the generation, so it aborts immediately. This indicates a malformed/unexpected response from the Luma proxy rather than bad user input.

Source

Thrown at comfy_api_nodes/nodes_luma.py:713

        raise ValueError(f"Maximum {max_count} reference images are allowed.")
    return out or None


async def _luma2_submit_and_poll(
    cls: type[IO.ComfyNode],
    request: Luma2GenerationRequest,
    *,
    estimated_duration: int | None = None,
) -> Luma2Generation:
    """Submit a Luma Agents generation and poll until done; returns the completed generation."""
    initial = await sync_op(
        cls,
        ApiEndpoint(path="/proxy/luma_2/generations", method="POST"),
        response_model=Luma2Generation,
        data=request,
    )
    if not initial.id:
        raise RuntimeError("Luma API did not return a generation id.")
    final = await poll_op(
        cls,
        ApiEndpoint(path=f"/proxy/luma_2/generations/{initial.id}", method="GET"),
        response_model=Luma2Generation,
        status_extractor=lambda r: r.state,
        progress_extractor=lambda r: None,
        estimated_duration=estimated_duration,
    )
    if not final.output or not final.output[0].url:
        msg = final.failure_reason or "no output returned"
        if final.failure_code:
            msg = f"{msg} [{final.failure_code}]"
        raise RuntimeError(f"Luma generation failed: {msg}")
    return final


class LumaImageNode(IO.ComfyNode):

View on GitHub (pinned to 1c6d8d45b3)

Solutions

1. Re-run the node once — transient malformed responses usually resolve.
2. Check the raw proxy response (enable API request logging) to confirm what body came back.
3. If persistent, update ComfyUI/comfy_api_nodes — the response model may need to track an upstream API change.
4. Report the response shape to the repo maintainers if it persists on the latest version.

for attempt in range(2):
    try:
        return await _luma2_submit_and_poll(cls, request)
    except RuntimeError as e:
        if "did not return a generation id" in str(e) and attempt == 0:
            continue  # malformed proxy response; one retry is cheap
        raise

When it happens

Trigger: The Luma 2 proxy accepts the generation request but returns a body missing the id field (API schema change, proxy error payload parsed into Luma2Generation, or an empty/malformed success response).

Common situations: Luma backend schema drift; a middleware/proxy returning an error envelope with 200; transient backend issues right after outages or version changes.

Related errors

• source_generation_id is required (connect the generation_id
• At least one of first_image and last_image requires an input
• Maximum {max_count} reference images are allowed.
• Luma generation failed: {msg}
• 'manga' style requires a portrait aspect ratio ({allowed_man

AI-assisted analysis of Comfy-Org/ComfyUI@1c6d8d45b3 (2026-08-14). Data as JSON: /api/errors/85fe8a1fedafc837. Report an issue: GitHub.