NullReferenceException on iOS when showing a popup and iPad changes orientation multiple times

[valdetero]

I have a popup that inherits from SlidePopupView. (Its a progress spinner that I show between navigating pages). When it is showing, and the iPad changes orientation from Portrait to Landscape and back again, it throws a NullReferenceException.

It throws it here: https://github.com/XAM-Consulting/SlideOverKit/blob/master/SlideOverKit.iOS/SlideOverKitiOSHandler.cs#L326
_backgroundOverlay.Frame = new CGRect (0, 0, ScreenSizeHelper.ScreenWidth, ScreenSizeHelper.ScreenHeight);
because _backgroundOverlay is null.

I pulled the source into my project and added a quick null check right above it and didn't notice any adverse side affects.

Could this line
if(_backgroundOverlay != null)
be added right above it?