Null Reference Exception while scrolling with OnDemandAutomatic

[John]

   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.Primitives.DataControlBase.OnListSourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.RadListSource.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.RadListSource.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 RadarLove.ViewModels.PrivateChatThreadsViewModel.<>c__DisplayClassa.<>c__DisplayClassc.<GetThreads>b__7()

[Deyan]

Hi John,

Thanks for writing.

Can you please submit a demo project which we can use to reproduce the exception on our side? Since we are not aware of similar issue currently, this will help us investigate it provide you with a fix as soon as possible.

Regards,
Deyan
the Telerik team