Warning can't perform a react state update on an unmounted component Code

When you're mounting your component, it'll be rendered and then the store will be updated. The state of the component is set to null, so you can't change it.However, once you mount, you have access to the mounted component's state and props. This can be used to do any work that needs to be done after the component was mounted.

Can't perform a React state update on an unmounted component

on Jan 01, 1970

useEffect(() => {
  let isMounted = true;               // note mutable flag
  someAsyncOperation().then(data => {
    if (isMounted) setState(data);    // add conditional check
  })
  return () => { isMounted = false }; // cleanup toggles value, if unmounted
}, []);                               // adjust dependencies to your needs

0

react warning can't perform a react state update on an unmounted component

on Jan 01, 1970

componentWillUnmount() {
    // fix Warning: Can't perform a React state update on an unmounted component
    this.setState = (state,callback)=>{
        return;
    };
}

0

Can't perform a React state update on an unmounted component

on Jan 01, 1970

const [loading, setLoading] = useState(false);
    const [someData, setSomeData] = useState({});
    let componentMounted = true; // (3) component is mounted
    // ...
    useEffect(() => {
        setLoading(true);
        someResponse = await doVeryLongRequest(); // it needs some time
        // When request is finished:
        if (componentMounted){ // (5) is component still mounted?
            setSomeData(someResponse.data); // (1) write data to state
            setLoading(false); // (2) write some value to state
        }
        return () => { // This code runs when component is unmounted
            componentMounted = false; // (4) set it to false if we leave the page
        }
    }, []);

0

A react state update is not possible on an unmounted component. The code above will display a blank screen:

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