NullReferenceException Updating ObservableCollection for Series

[Stephen]

I just upgraded Telerik UI from v2016.2.708.1 to v2017.2.614.2, and I'm now getting an exception thrown when I try to add a data point to a series. The series is bound to an ObservableCollection, and I can work around the problem by replacing the entire collection when new data is added, but that obviously defeats the purpose of using ObservableCollection.

Has anybody run into this issue? Stack trace follows. Thanks.

====================================================================================

06-20 12:18:53.481 I/MonoDroid( 2065): UNHANDLED EXCEPTION:
06-20 12:18:53.482 I/MonoDroid( 2065): System.NullReferenceException: Object reference not set to an instance of an object.
06-20 12:18:53.482 I/MonoDroid( 2065):   at Telerik.XamarinForms.ChartRenderer.Android.BaseChartRenderer`2[TChart,TNativeChart].Telerik.XamarinForms.Chart.IChartRenderer.OnSeriesSourceCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, System.Object series) [0x0000c] in <18a6b9b1742b4acca8ea1bef8ca6f563>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at Telerik.XamarinForms.Chart.RadCartesianChart.SeriesSource_CollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00009] in <18a6b9b1742b4acca8ea1bef8ca6f563>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at (wrapper delegate-invoke) <Module>:invoke_void_object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000f] in <a547bd0d78184f26ab08d022f013c1e1>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00009] in <a547bd0d78184f26ab08d022f013c1e1>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.ObservableCollection`1[T].InsertItem (System.Int32 index, T item) [0x00024] in <a547bd0d78184f26ab08d022f013c1e1>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020] in <3fd174ff54b146228c505f23cf75ce71>:0 

[Stefan Nenchev]

Hello Stephen,

I was not able to reproduce the behavior you have reported. Please have a look at the attached example and update me whether you are noticing any issues with it. It will be great if you can modify it so that the behavior can be reproduced or share more information on the exact scenario at your end.

Have a great rest of the week.

Regards,
Stefan Nenchev
Progress Telerik