Kong/insomnia · error · InsoError

Expected single ${entity} in the data store, but found none.

Error message

Expected single ${entity} in the data store, but found none.

What it means

Error "Expected single ${entity} in the data store, but found none." thrown in Kong/insomnia.

Source

Thrown at packages/insomnia-inso/src/db/models/util.ts:48

export const ensureSingleOrNone = <T>(items: T[], entity: string): T | null | undefined => {
  if (items.length === 1) {
    return items[0];
  }

  if (items.length === 0) {
    return null;
  }

  throw new InsoError(`Expected single or no ${entity} in the data store, but found multiple (${items.length}).`);
};
export const ensureSingle = <T>(items: T[], entity: string): T => {
  if (items.length === 1) {
    return items[0];
  }

  if (items.length === 0) {
    throw new InsoError(`Expected single ${entity} in the data store, but found none.`);
  }

  throw new InsoError(`Expected single ${entity} in the data store, but found multiple (${items.length}).`);
};

View on GitHub (pinned to d9bb2b0142)

When it happens

Trigger: Thrown at packages/insomnia-inso/src/db/models/util.ts:48 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Kong/insomnia@d9bb2b0142 (2026-08-26). Data as JSON: /api/errors/a783d746b4bfff52. Report an issue: GitHub.