StackingColums + Line (or Spline) Series exception after nuget packages update

[kola]

Hello!

We are using SfChart in our project extensively. Some charts are combination of StackingColumnsSeries and SplineSeries. 

The current production config includes  Xamarin.Forms (2.3.4.270) and Syncfusion SfChart (15.2.0.46).

After upgrading packages to latest Xamarin.Forms (2.5.0.91635) and Syncfusion (15.4.0.17) 

all the charts containing both StackingColumnsSeries and SplineSeries

raise exception

Object reference not set to an instance of an object

  at Syncfusion.SfChart.iOS.SFStackingSeries.CalculateStackingValues () [0x00042] in <7de39a909d9040739291f86c130134a9>:0 

  at Syncfusion.SfChart.iOS.SFStackingColumnSeries.CreateSegments () [0x00013] in <7de39a909d9040739291f86c130134a9>:0 

  at Syncfusion.SfChart.iOS.SFSeries.InternalCreateSegments () [0x00020] in <7de39a909d9040739291f86c130134a9>:0 

  at Syncfusion.SfChart.iOS.SFChart.UpdateChart () [0x001c5] in <7de39a909d9040739291f86c130134a9>:0 

  at Syncfusion.SfChart.iOS.SFChart.LayoutSubviews () [0x00006] in <7de39a909d9040739291f86c130134a9>:0 

Here is the sample to reproduce the issue

https://drive.google.com/file/d/1AlyAH2DDnTiUTOmwPNzi869URYGwbCpH/view?usp=sharing

[Parthiban Sundaram]

Hi Ivan,

Thanks for using Syncfusion products.

We have created an incident under your Direct Trac account. So, we request to follow the incident for further details.

Our Direct Trac support system can be accessed from the following link:

https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents  

Regards,
Parthiban S.