System.ArgumentException crash in custom UWP FrameRenderer

Hi,

I'm using a custom FrameRenderer in my UWP project to style frames (corner radius and color). When I scroll a bit back and forth, the app crashes with a System.ArgumentException: Value does not fall within the expected range. It's the call to base.OnElementChanged(e); that causes it.

I can of course put that in a try/catch, but then some items in my list will disappear. They return on orientation change of the device, but not after a normal refresh of the FlowListView I'm using.

Any ideas? I'm on Xamarin Forms 2.5.1.444934.

Here's the custom FrameRenderer:

class ExtendedFrameRenderer : FrameRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<Frame> e)
    {
        base.OnElementChanged(e);

        if (Control != null)
        {
            var frame = e.NewElement;
            double cornerRadius = frame.CornerRadius;

            Windows.UI.Color frameBG = Windows.UI.Color.FromArgb(
                (byte)(frame.BackgroundColor.A * 255),
                (byte)(frame.BackgroundColor.R * 255),
                (byte)(frame.BackgroundColor.G * 255),
                (byte)(frame.BackgroundColor.B * 255));

            Control.CornerRadius = new Windows.UI.Xaml.CornerRadius(cornerRadius);
            Control.Background = new SolidColorBrush(frameBG);
            frame.BackgroundColor = Xamarin.Forms.Color.Transparent;
        }
    }
}

Full error stack:

System.ArgumentException
  HResult=0x80070057
  Message=Value does not fall within the expected range.
  Source=Windows
  StackTrace:
   at Windows.UI.Xaml.Controls.Border.put_Child(UIElement value)
   at Xamarin.Forms.Platform.UWP.FrameRenderer.PackChild()
   at Xamarin.Forms.Platform.UWP.FrameRenderer.OnElementChanged(ElementChangedEventArgs`1 e)
   at MyApp.UWP.Helpers.ExtendedFrameRenderer.OnElementChanged(ElementChangedEventArgs`1 e) in C:\Users\me\Source\Workspaces\MySol\MyApp\MyApp.UWP\Helpers\ExtendedFrameRenderer.cs:line 26
   at Xamarin.Forms.Platform.UWP.VisualElementRenderer`2.SetElement(VisualElement element)
   at Xamarin.Forms.Platform.UWP.Platform.CreateRenderer(VisualElement element)
   at Xamarin.Forms.Platform.UWP.VisualElementPackager.OnChildAdded(Object sender, ElementEventArgs e)
   at Xamarin.Forms.Platform.UWP.VisualElementPackager.Load()
   at Xamarin.Forms.Platform.UWP.VisualElementRenderer`2.SetElement(VisualElement element)
   at Xamarin.Forms.Platform.UWP.Platform.CreateRenderer(VisualElement element)
   at Xamarin.Forms.Platform.UWP.VisualElementPackager.OnChildAdded(Object sender, ElementEventArgs e)
   at Xamarin.Forms.Platform.UWP.VisualElementPackager.Load()
   at Xamarin.Forms.Platform.UWP.VisualElementRenderer`2.SetElement(VisualElement element)
   at Xamarin.Forms.Platform.UWP.Platform.CreateRenderer(VisualElement element)
   at Xamarin.Forms.Platform.UWP.ViewToRendererConverter.WrapperControl..ctor(View view)
   at Xamarin.Forms.Platform.UWP.ViewToRendererConverter.Convert(Object value, Type targetType, Object parameter, String language)