20 lines
626 B
Markdown
20 lines
626 B
Markdown
---
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tags:
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- javascript
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- react
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---
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# Errors
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## State update on unmounted component
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> Can't perform a React state update on an unmounted component. This is a no-op,
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> but it indicates a memory leak in your application. To fix, cancel all
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> subscriptions and asynchronous tasks in a useEffect cleanup function.
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This typically happens when you have an API request running in the background.
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Once the data is returned, React tries to update the state but the component is
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unmounted.
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As the warning suggests, this can be resolved using the cleanup parameter within
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[React_useEffect](React_useEffect.md#cleanup-functions).
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