NRE

System.NullReferenceException: Object reference not set to an instance of an object.
at SuperMemoAssistant.Plugins.SessionInformation.SessionInformationPlugin.CreateSuperMemoEvent(EventOrigin Origin, Boolean IncludeContent) in C:\Users\james\source\repos\SessionInformation\src\SuperMemoAssistant.Plugins.SessionInformation\SessionInformationPlugin.cs:line 248
at SuperMemoAssistant.Plugins.SessionInformation.SessionInformationPlugin.b__38_3(IObservable`1 x) in C:\Users\james\source\repos\SessionInformation\src\SuperMemoAssistant.Plugins.SessionInformation\SessionInformationPlugin.cs:line 191
at System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Select.cs:line 39
--- End of stack trace from previous location where exception was thrown ---
at System.Reactive.PlatformServices.ExceptionServicesImpl.Rethrow(Exception exception) in /_/Rx.NET/Source/src/System.Reactive/Internal/ExceptionServicesImpl.cs:line 16
at System.Reactive.Stubs.<>c.<.cctor>b__2_1(Exception ex) in /_/Rx.NET/Source/src/System.Reactive/Internal/Stubs.cs:line 16
at System.Reactive.AnonymousSafeObserver`1.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/AnonymousSafeObserver.cs:line 62
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Sink`2.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 96
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Linq.ObservableImpl.SelectMany`2.ObservableSelector._.InnerObserver.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/SelectMany.cs:line 954
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Linq.ObservableImpl.ToList`1._.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/ToList.cs:line 40
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Sink`2.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 96
at System.Reactive.Subjects.Subject`1.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Subjects/Subject.cs:line 103
at System.Reactive.Linq.ObservableImpl.Window`2.Boundaries._.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Window.cs:line 724
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Sink`2.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 96
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Linq.ObservableImpl.Buffer`1.CountOverlap.OverlapSink.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Buffer.cs:line 229
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Sink`2.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 96
at System.Reactive.Subjects.Subject`1.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Subjects/Subject.cs:line 103
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Sink`2.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 96
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Linq.ObservableImpl.Merge`1.Observables._.InnerObserver.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Merge.cs:line 244