Comfy-Org/ComfyUI · error · Exception

Kling task {response.data.task_id} succeeded but no video da

Error message

Kling task {response.data.task_id} succeeded but no video data found in response.

What it means

Raised by validate_video_result_response after a Kling video task reported success but the response contains no playable video in task_result.videos. The task lifecycle completed (polled to a terminal state), yet the result payload is missing the video entry — an upstream data inconsistency, and the response.data.task_id is embedded in the message.

Source

Thrown at comfy_api_nodes/nodes_kling.py:307

            f"Negative prompt is too long: {len(negative_prompt)} characters"
        )
    return True


def validate_task_creation_response(response) -> None:
    """Validates that the Kling task creation request was successful."""
    if not is_valid_task_creation_response(response):
        error_msg = f"Kling initial request failed. Code: {response.code}, Message: {response.message}, Data: {response.data}"
        logging.error(error_msg)
        raise Exception(error_msg)


def validate_video_result_response(response) -> None:
    """Validates that the Kling task result contains a video."""
    if not is_valid_video_response(response):
        error_msg = f"Kling task {response.data.task_id} succeeded but no video data found in response."
        logging.error("Error: %s.\nResponse: %s", error_msg, response)
        raise Exception(error_msg)


def validate_image_result_response(response) -> None:
    """Validates that the Kling task result contains an image."""
    if not is_valid_image_response(response):
        error_msg = f"Kling task {response.data.task_id} succeeded but no image data found in response."
        logging.error("Error: %s.\nResponse: %s", error_msg, response)
        raise Exception(error_msg)


def validate_input_image(image: torch.Tensor) -> None:
    """
    Validates the input image adheres to the expectations of the Kling API:
    - The image resolution should not be less than 300*300px
    - The aspect ratio of the image should be between 1:2.5 ~ 2.5:1

    See: https://app.klingai.com/global/dev/document-api/apiReference/model/imageToVideo
    """

View on GitHub (pinned to 1c6d8d45b3)

Solutions

Re-run the Kling video node to create a fresh task
Record the task_id from the message and check it in the Kling developer console
If persistent across prompts, check Kling status pages or API changelog for result-schema changes
Reduce requested duration/resolution to shorten generation time and avoid artifact expiry

Defensive patterns

Strategy: retry

Try / catch

for attempt in range(2):
    try:
        out = await kling_video_node(...)
        break
    except Exception as e:
        if attempt == 1 or "no video data found" not in str(e):
            raise

Prevention

Re-submit the task on this inconsistency; it is usually not input-related
Keep the task_id from the message for console follow-up
Avoid extremely long generations that outlive result storage

When it happens

Trigger: Kling marks a video task as succeeded but returns task_result without videos (or videos empty) — server-side rendering pipeline failure, expired result storage, or a schema change in the result payload.

Common situations: Long video jobs whose artifacts expire before retrieval; Kling infra incidents; very rare and usually resolved by re-submitting the task.

Related errors

AI-assisted analysis of Comfy-Org/ComfyUI@1c6d8d45b3 (2026-08-14). Data as JSON: /api/errors/4bda99cd22e7f762. Report an issue: GitHub.