Item Repeater WrapLayout Throws

[MohamedElhamzawy1993]

Describe the bug

I have a grid of 2 columns and a grid splitter. The second column has an item repeater of borders. When resizing with the grid splitter the app throws a null exception.
ItemRepeaterBug.zip

To Reproduce

`

	<!-- GridSplitter for resizing -->
	<GridSplitter Grid.Column="1" Width="5" HorizontalAlignment="Center" VerticalAlignment="Stretch" />

	<!-- ItemsRepeater in the Second Column -->
	<ItemsRepeater Name="ItemsRepeater" ItemsSource="{Binding Skills}" Grid.Column="2">
		<ItemsRepeater.Layout>
			<WrapLayout
				Orientation="Horizontal"
				VerticalSpacing="15"
				HorizontalSpacing="15" />
		</ItemsRepeater.Layout>
		<ItemsRepeater.ItemTemplate>
			<DataTemplate>
				<Border BorderBrush="Black"
						BorderThickness="2"
						Background="{DynamicResource ArWhite}"
						Height="80"
						Width="70">
				</Border>
			</DataTemplate>
		</ItemsRepeater.ItemTemplate>
	</ItemsRepeater>
</Grid>`
` public partial class MainViewModel : ViewModelBase
        {
            public ObservableCollection<int> Skills { get; } = new ObservableCollection<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
        }`

Expected behavior

No response

Avalonia version

11.0.10

OS

Windows

Additional context

No response

[MohamedElhamzawy1993]

ItemRepeaterBug.zip