langflow-ai/langflow · error · ValueError

Flow version ids cannot be present in both add/remove operat

Error message

Flow version ids cannot be present in both add/remove operations: {ids}.

What it means

Error "Flow version ids cannot be present in both add/remove operations: {ids}." thrown in langflow-ai/langflow.

Source

Thrown at src/backend/base/langflow/api/v1/mappers/deployments/contracts.py:84

class FlowVersionPatch(BaseModel):
    """Normalized add/remove patch used by attachment reconciliation."""

    add_flow_version_ids: list[UUID] = Field(default_factory=list)
    remove_flow_version_ids: list[UUID] = Field(default_factory=list)

    @field_validator("add_flow_version_ids", "remove_flow_version_ids")
    @classmethod
    def _dedupe_ids(cls, values: list[UUID]) -> list[UUID]:
        return list(dict.fromkeys(values))

    @model_validator(mode="after")
    def _validate_no_overlap(self) -> FlowVersionPatch:
        overlap = set(self.add_flow_version_ids).intersection(self.remove_flow_version_ids)
        if overlap:
            ids = ", ".join(sorted(str(value) for value in overlap))
            msg = f"Flow version ids cannot be present in both add/remove operations: {ids}."
            raise ValueError(msg)
        return self

View on GitHub (pinned to 976ec789d2)

Solutions

1. Remove the duplicated flow version ids from either the add or the remove list; an id cannot appear in both.

When it happens

Trigger: Occurs when the same flow version id appears in both the add and remove lists of a deployment update operation.

Common situations: See trigger scenarios.

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/f321234c0db87bcf. Report an issue: GitHub.