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SCA is unreliabe

I get this error , randomly , now consistently

RedGate.Versioning.Client.VsShell.Ssms.Models.Observable.UnhandledObserverException: A subscribed observable threw an unhandled exception: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at RedGate.Versioning.Client.VsShell.Ssms.Ui.Utilities.ObjectFilterer.<>c__DisplayClass0_0`1.<Filter>b__0(T x)
   at System.Linq.Enumerable.WhereArrayIterator`1.MoveNext()
   at System.Collections.ObjectModel.CollectionExtensions.AddRange[T](Collection`1 collection, IEnumerable`1 items)
   at RedGate.Versioning.Client.VsShell.Ssms.Ui.Views.GenerateMigrations.GenerateMigrationsViewModel.UpdateFilteredDifferences()
   at RedGate.Versioning.Client.VsShell.Ssms.Ui.Views.GenerateMigrations.GenerateMigrationsViewModel.OnComparisonModelUpdated(ProjectComparisonModel comparisonModel)
   at RedGate.Versioning.Client.VsShell.Ssms.Models.Observable.ActionObserver`1.OnNext(T value)
   at RedGate.Versioning.Client.VsShell.Ssms.Models.Observable.Subject`1.Next(T value)
   --- End of inner exception stack trace ---=

There seems to be no information to help 

Where do we go to get help, what does this error mean ?


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