Don't set the _scrollComponent if it is undefined or null

[rahuljiresal]

This fixes the crash with Unhandled JS Exception: null is not an object (evaluating 'this._scrollComponent.getScrollResponder')

[ide]

We want to set it to null or else we'll have memory leaks. Can you figure out what this._scrollComponent.getScrollResponder is being accessed even when the underlying scroll component has been unmounted?

[rahuljiresal]

You're right about the leak. The leak will manifest into a crash after a long time, but it will do that.

I had a line that did this.refs.scrollView && this.refs.scrollView.scrollTo({x: 0, y: 0, animated: true}); where scrollView is the InvertibleScrollView. But since the underlying scrollview got unmounted somehow, when the scrollTo method tries to get the scrollResponder, it crashes.

I changed it to this.refs.scrollView && this.refs.scrollView._scrollComponent && this.refs.scrollView.scrollTo({x: 0, y: 0, animated: true}); and it works. But I think this.refs.scrollView should be undefined if the underlying scrollview has been unmounted.

[ide]

Are you perhaps unmounting the InvertibleScrollView (this.refs.scrollView) and forgetting to unset to ref?