facebook/react · error · Error

146

146

Error message

React Component in warnForMissingKey should have a _store. This error is likely caused by a bug in React. Please file an issue.

What it means

Error "React Component in warnForMissingKey should have a _store. This error is likely caused by a bug in React. Please file an issue." thrown in facebook/react.

Source

Thrown at packages/react-reconciler/src/ReactChildFiber.js:169

  warnForMissingKey = (
    returnFiber: Fiber,
    workInProgress: Fiber,
    child: mixed,
  ) => {
    if (child === null || typeof child !== 'object') {
      return;
    }
    if (
      !child._store ||
      ((child._store.validated || child.key != null) &&
        child._store.validated !== 2)
    ) {
      return;
    }

    if (typeof child._store !== 'object') {
      throw new Error(
        'React Component in warnForMissingKey should have a _store. ' +
          'This error is likely caused by a bug in React. Please file an issue.',
      );
    }

    // $FlowFixMe[cannot-write] unable to narrow type from mixed to writable object
    child._store.validated = 1;

    const componentName = getComponentNameFromFiber(returnFiber);

    const componentKey = componentName || 'null';
    if (ownerHasKeyUseWarning[componentKey]) {
      return;
    }
    ownerHasKeyUseWarning[componentKey] = true;

    const childOwner = child._owner;
    const parentOwner = returnFiber._debugOwner;

View on GitHub (pinned to eafeac097b)

When it happens

Trigger: Thrown at packages/react-reconciler/src/ReactChildFiber.js:169 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of facebook/react@eafeac097b (2026-08-21). Data as JSON: /api/errors/61fae1b4c532507a. Report an issue: GitHub.