application dies when re-rendering component

[Allegseu95]

Describe the bug
When re-rendering the component in "react-native" version: "0.63.5", the app crashes. An error is identified that subscription.remove() is not a function because subscription is undefined.

To Reproduce
Steps to reproduce the behavior:

1. You are in the view where your Swipe Button component is.
2. you go to any other view
3. You return to the first view where the Swipe Button component is
4. and the app dies and shows the mentioned error

Expected behavior
I hope that when re-rendering the component the app does not die

Additional context
It is solved by adding optional chaining in subscription in the useEffect return function