langflow-ai/langflow · error · HTTPException

Flow version {row.flow_version_id} has no data (snapshot may

Error message

Flow version {row.flow_version_id} has no data (snapshot may be corrupted).

What it means

Error "Flow version {row.flow_version_id} has no data (snapshot may be corrupted)." thrown in langflow-ai/langflow.

Source

Thrown at src/backend/base/langflow/api/v1/mappers/deployments/helpers.py:181

                Deployment.user_id == user_id,
                Deployment.project_id == Flow.folder_id,
            ),
        )
        .order_by(indexed_flow_version_ids_cte.c.position)
    )
    rows = list((await db.exec(statement)).all())
    if len(rows) < len(flow_version_ids):
        msg = (
            "One or more flow versions are invalid. "
            "Please ensure the flows belong to the project containing the deployment."
        )
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=msg)

    artifacts: list[tuple[UUID, int, UUID, BaseFlowArtifact]] = []
    for row in rows:
        if row.flow_version_data is None:
            msg = f"Flow version {row.flow_version_id} has no data (snapshot may be corrupted)."
            raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=msg)
        artifacts.append(
            (
                row.flow_version_id,
                row.flow_version_number,
                row.project_id,
                BaseFlowArtifact(
                    id=row.flow_id,
                    name=row.flow_name,
                    description=row.flow_description,
                    data=row.flow_version_data,
                    tags=row.flow_tags,
                ),
            )
        )
    return artifacts


async def build_project_scoped_flow_artifacts_from_flow_versions(

View on GitHub (pinned to 976ec789d2)

Solutions

1. Re-create the checkpoint/version for the flow; the stored snapshot data is missing or corrupted.

When it happens

Trigger: Occurs when a referenced flow version row has null data, indicating a possibly corrupted snapshot.

Common situations: See trigger scenarios.

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/e7122a45bfd1b4ee. Report an issue: GitHub.