Pluginリスト表示で落ちる

プラグイン相性かなあ WPF内部のテキスト描写領域サイズ計算でおちてるっぽいが、どうしてこうなる？
ExceptionType:
System.ArithmeticException
ExceptionMessage:
算術演算でオーバーフローまたはアンダーフローが発生しました。
ExceptionStackTrace:
場所 System.Double.Equals(Object obj)
場所 System.Object.Equals(Object objA, Object objB)
場所 System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, Object controlValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, Boolean skipBaseValueChecks)
場所 System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
場所 System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
場所 System.Windows.Controls.TextBlock.MeasureOverride(Size constraint)
場所 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
場所 System.Windows.UIElement.Measure(Size availableSize)
場所 MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
場所 System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
場所 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
場所 System.Windows.UIElement.Measure(Size availableSize)
場所 System.Windows.Controls.StackPanel.StackMeasureHelper(IStackMeasure measureElement, IStackMeasureScrollData scrollData, Size constraint)
場所 System.Windows.Controls.StackPanel.MeasureOverride(Size constraint)
場所 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
場所 System.Windows.UIElement.Measure(Size availableSize)
場所 System.Windows.Controls.Control.MeasureOverride(Size constraint)
場所 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
場所 System.Windows.UIElement.Measure(Size availableSize)
場所 System.Windows.Controls.StackPanel.StackMeasureHelper(IStackMeasure measureElement, IStackMeasureScrollData scrollData, Size constraint)
場所 System.Windows.Controls.StackPanel.MeasureOverride(Size constraint)
場所 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
場所 System.Windows.UIElement.Measure(Size availableSize)
場所 System.Windows.ContextLayoutManager.UpdateLayout()
場所 System.Windows.UIElement.UpdateLayout()
場所 System.Windows.Controls.TabItem.OnPreviewGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
場所 System.Windows.UIElement.OnPreviewGotKeyboardFocusThunk(Object sender, KeyboardFocusChangedEventArgs e)
場所 System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
場所 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
場所 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
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