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React component suspended while responding to synchronous input

A component suspended while responding to synchronous input. This will cause the UI to be replaced with a loading indicator.

React detected a suspension during synchronous user input, which can cause the current UI to be replaced by a fallback unless the update is scheduled as a transition.

React error #426runtime

Observed message

A component suspended while responding to synchronous input. This will cause the UI to be replaced with a loading indicator.

Why it happens

  • A state update triggered by direct user input caused a component to suspend.
  • Async rendering work runs on the urgent input path instead of in a transition.
  • Suspense boundaries are handling input-triggered updates as blocking work.

How to fix it

  1. Wrap updates that may suspend in startTransition.
  2. Separate urgent input state from deferred rendering state.
  3. Review Suspense boundaries and async data work triggered directly by input.

Official reference

React Docs: Minified React error #426

Related errors

React error #187React flushSync called inside a lifecycle methodReact error #307React Hooks called outside a function componentReact error #404React invalid hook callReact error #321React invalid hook call with mismatched versions or duplicate React

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React error #426 component suspended while responding to input | Error Atlas