ArgumentNullException: Value cannot be null. Parameter name: first StackTrace: at System.Linq.Enumerable.SequenceEqual[TSource](IEnumerable`1 first, IEnumerable`1 second, IEqualityComparer`1 comparer) at IntelliTools.Domain.MyClipboard.FileClipItem.Val_Equals(ClipItemBase other) at IntelliTools.View.BackgroundWindow.CollectClipItem(ClipItemBase item) at IntelliTools.View.BackgroundWindow.LasyOnClipboardChanged() at IntelliTools.View.BackgroundWindow.Timer_Tick(Object sender, EventArgs e) at System.Windows.Threading.DispatcherTimer.FireTick(Object unused) 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)