BarChartView  if all chartitem.value = 0    will crash

like  sample  set all chartitem.value = 0   , app will crash
ObservableCollection<ChartItem> _chartCollection = new ObservableCollection<ChartItem>()
		{
			{new ChartItem(){ Value= 0, Label = "a"}},
			{new ChartItem(){ Value= 0, Label = "b"} },
			{new ChartItem(){ Value= 0, Label = "c"} },
			{new ChartItem(){ Value= 0, Label = "d"} },
			{new ChartItem(){ Value= 0, Label = "e"} }
		};