facebook/react · error · Error
451
451
Error message
resolveSingletonInstance was called with an element type that is not supported. This is a bug in React.
What it means
Error "resolveSingletonInstance was called with an element type that is not supported. This is a bug in React." thrown in facebook/react.
Source
Thrown at packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js:4865
' not found. React never removes the head for any Document it renders into so' +
' the cause is likely in some other script running on this page.',
);
}
return head;
}
case 'body': {
const body = ownerDocument.body;
if (!body) {
throw new Error(
'React expected a <body> element (document.body) to exist in the Document but one was' +
' not found. React never removes the body for any Document it renders into so' +
' the cause is likely in some other script running on this page.',
);
}
return body;
}
default: {
throw new Error(
'resolveSingletonInstance was called with an element type that is not supported. This is a bug in React.',
);
}
}
}
export function acquireSingletonInstance(
type: string,
props: Props,
instance: Instance,
internalInstanceHandle: Object,
): void {
if (__DEV__) {
if (
// If this instance is the container then it is invalid to acquire it as a singleton however
// the DOM nesting validation will already warn for this and the message below isn't semantically
// aligned with the actual fix you need to make so we omit the warning in this case
!isContainerMarkedAsRoot(instance) &&View on GitHub (pinned to eafeac097b)
When it happens
Trigger: Thrown at packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js:4865 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/1375766498a1bddd.
Report an issue: GitHub.