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

리액트를 이용하여 모달 컴포넌트를 개발 하던중 다음과 같은 에러가 발생하였다. Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. 경고!