getting an exception error of unmount Transition shared key

[theshahzaib5]

I have registered the key on screen A and getting it as a target on screen B when I return back to previous screen or dashboard screen, Then react through this error:

ExceptionsManager.js:82 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 the componentWillUnmount method.

tell me how i can cancel the transition animation subscription from render?