Exception with some merges (C++)

[JoergR]

With some merges, SemanticMerge shows the following exception:

System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei Codice.CM.SemanticMerge.Gui.SemanticTelemetry.b(d2 A_0)
bei Codice.CM.SemanticMerge.Gui.SemanticTelemetry.TrackMergeResult(d2 mergeResult)
bei Codice.CM.SemanticMerge.Gui.Merge.MergeWindow.AfterMergeCalculated()
bei Codice.Client.Common.Threading.ThreadWaiter.OnTimerTick()
bei System.Windows.Forms.Timer.OnTick(EventArgs e)

This is with C++ files. I haven't had the exception yet with C#, but I'm working mainly with C++ anyway.

Luckily, I can then ignore the exception and start a text merge, but SemanticMerge itself isn't usable when the exception occurs.