System.InvalidOperationException: Internal error

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nook
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System.InvalidOperationException: Internal error

Do you have any clue why would this error occur when selecting or searching an author?
As consequence, the author or book images disappear from the view, they won't load anymore, but an app restart will clear the issue.
It is not possible to reproduce it, but it doesn't seem critical (for the moment).

2016-09-18 20:32:16.6881|INFO|AlfaNetSoft.AEM.Applications.Log|Apply Filter: Undefiend - System.Windows.Controls.SelectedItemCollection
2016-09-18 20:32:17.3760|ERROR|AlfaNetSoft.AEM.Applications.Log|System.InvalidOperationException: Internal error: internal WPF code tried to reactivate a BindingExpression that was already marked as detached.
at System.Windows.Data.BindingExpressionBase.SetStatus(BindingStatusInternal status)
at MS.Internal.Data.ClrBindingWorker.SetStatus(PropertyPathStatus status)
at MS.Internal.Data.ClrBindingWorker.CompleteGetValue(AsyncGetValueRequest request)
at MS.Internal.Data.ClrBindingWorker.OnCompleteGetValueOperation(Object arg)
at MS.Internal.Data.DataBindOperation.Invoke()
at MS.Internal.Data.DataBindEngine.ProcessCrossThreadRequests()
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

admin
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nook, could you please send us (support@alfaebooks.com) your database file?