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Created attachment 14062 [details]
An exception is thrown, when an Editor has focus and the back button is clicked on UWP.
A repro project is attached. Run the UWP project, click the Editor Button to open the subpage, focus the Editor and click the back arrow. The app crashes with the following exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at Xamarin.Forms.Platform.UWP.EditorRenderer.OnLostFocus(Object sender, RoutedEventArgs e)
If the Editor loses focus while the page is open, then it works.
If you run the WinRT project (or any other platform which is not included in the sample), then it works fine.
Should be fixed in 2.0.1-pre1