NullReference Exception

[Imran Shafiq]

This is all over our production logs. 


at Telerik.Windows.Controls.RadDataBoundListBox.get_LastRealizedDataItem()
at Telerik.Windows.Controls.VirtualizationStrategy.RefreshViewportOnItemAdded(IDataSourceItem addedItem)
at Telerik.Windows.Controls.RadVirtualizingDataControl.UpdateViewportOnItemsChange(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Controls.RadVirtualizingDataControl.OnItemsChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Controls.RadDataBoundListBox.OnItemsChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Controls.RadJumpList.OnItemsChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Controls.Primitives.DataControlBase.OnListSourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.RadListSource.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.RadCollectionViewSource.CreateAndAddNewItem(Object newItem, Int32 newIndex)
at Telerik.Windows.Data.RadCollectionViewSource.SourceCollectionChangedOverride(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.RadListSource.OnSourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.RadListSource.Telerik.Windows.Data.IWeakEventListener.ReceiveEvent(Object sender, EventArgs e)
at Telerik.Windows.Data.WeakEventHandler`1.ProcessEvent(Object sender, EventArgs e)
at Telerik.Windows.Data.WeakEventHandler`1.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at Wine.ViewModels.MainPageViewModel.

[Deyan]

Hi Imran,

Thanks for writing.

This is something we are currently not aware of but are willing to investigate.

Is it possible for you to send us a sample project that reproduces the scenario so that we can debug it on our side and see what causes the exception?

Regards,
Deyan
Telerik