Evolver-triggers-exception-in-Advanced-Smoothers

When clicking on a long running strategy in Evolver I got this one:

CODE:
System.NullReferenceException: Object reference not set to an instance of an object.
   at WealthLab.AdvancedSmoothers.AdaptiveLookback.Series(BarHistory source, Int32 numberOfSwings, Boolean fastSwing, Boolean preciseDetection, Boolean parameterless)
   at WealthLab.AdvancedSmoothers.WLMA.†††
†††‡—(Object , Int32 numberOfSwings, Boolean fastSwing, Boolean preciseDetection, Boolean parameterless)
   at WealthLab.AdvancedSmoothers.WLMA.Populate()
   at WealthLab.Indicators.IndicatorFactory.ReconcileIndicator(IndicatorBase ib, BarHistory bh, List`1 indicators)
   at WealthLab.Indicators.IndicatorFactory.ReconcileDummy(IndicatorBase ib)
   at WealthLab.Core.Parameter.GetIndicatorDesc()
   at WealthLab.Backtest.IndicatorCrossesSignalLine.get_Description()
   at WealthLab8.cwStrategyEvolver.ReadMethod(Object config, SelectionChangedEventArgs caller)
   at System.Windows.Controls.SelectionChangedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
  ...