Trying to generate PDB crashes from CustomDialog

[lempamo]

Found running in Debian 10

Sorry, we crashed
System.NullReferenceException: Object reference not set to an instance of an object.
   at ICSharpCode.ILSpy.Controls.CustomDialog.<.ctor>b__6_1(Object container, TemplateAppliedEventArgs args) in /home/runner/work/AvaloniaILSpy/AvaloniaILSpy/ILSpy.Core/Controls/CustomDialog.xaml.cs:line 65
   at Avalonia.Interactivity.Interactive.<AddHandler>g__InvokeAdapter|4_0[TEventArgs](Delegate baseHandler, Object sender, RoutedEventArgs args) in /_/src/Avalonia.Interactivity/Interactive.cs:line 60
   at Avalonia.Interactivity.Interactive.<>c__4`1.<AddHandler>b__4_1(Delegate baseHandler, Object sender, RoutedEventArgs args) in /_/src/Avalonia.Interactivity/Interactive.cs:line 66
   at Avalonia.Interactivity.EventRoute.RaiseEventImpl(RoutedEventArgs e) in /_/src/Avalonia.Interactivity/EventRoute.cs:line 152
   at Avalonia.Interactivity.EventRoute.RaiseEvent(IInteractive source, RoutedEventArgs e) in /_/src/Avalonia.Interactivity/EventRoute.cs:line 79
   at Avalonia.Interactivity.Interactive.RaiseEvent(RoutedEventArgs e) in /_/src/Avalonia.Interactivity/Interactive.cs:line 121
   at Avalonia.Controls.Primitives.TemplatedControl.ApplyTemplate() in /_/src/Avalonia.Controls/Primitives/TemplatedControl.cs:line 269
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Controls.StackPanel.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/StackPanel.cs:line 207
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Controls.Presenters.ItemVirtualizer.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Presenters/ItemVirtualizer.cs:line 221
   at Avalonia.Controls.Presenters.ItemsPresenter.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Presenters/ItemsPresenter.cs:line 139
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Controls.Presenters.ScrollContentPresenter.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Presenters/ScrollContentPresenter.cs:line 256
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) in /_/src/Avalonia.Controls/Grid.cs:line 1149
   at Avalonia.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) in /_/src/Avalonia.Controls/Grid.cs:line 1004
   at Avalonia.Controls.Grid.MeasureOverride(Size constraint) in /_/src/Avalonia.Controls/Grid.cs:line 489
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 46
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 39
   at Avalonia.Controls.Border.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Border.cs:line 121
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) in /_/src/Avalonia.Controls/Grid.cs:line 1149
   at Avalonia.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) in /_/src/Avalonia.Controls/Grid.cs:line 1004
   at Avalonia.Controls.Grid.MeasureOverride(Size constraint) in /_/src/Avalonia.Controls/Grid.cs:line 438
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 46
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 39
   at Avalonia.Controls.Presenters.ContentPresenter.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 362
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 46
   at Avalonia.Controls.Primitives.VisualLayerManager.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Primitives/VisualLayerManager.cs:line 133
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 602
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Controls.Window.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Window.cs:line 857
   at Avalonia.Controls.WindowBase.MeasureCore(Size availableSize) in /_/src/Avalonia.Controls/WindowBase.cs:line 246
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 386
   at Avalonia.Layout.LayoutManager.Measure(ILayoutable control) in /_/src/Avalonia.Layout/LayoutManager.cs:line 275
   at Avalonia.Layout.LayoutManager.ExecuteInitialLayoutPass() in /_/src/Avalonia.Layout/LayoutManager.cs:line 174
   at Avalonia.Controls.Window.ShowDialog[TResult](Window owner) in /_/src/Avalonia.Controls/Window.cs:line 733
   at ICSharpCode.ILSpy.MessageBox.Show(Window owner, String messageBoxText, String caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult, MessageBoxOptions options) in /home/runner/work/AvaloniaILSpy/AvaloniaILSpy/ILSpy.Core/MessageBox.cs:line 76
   at ICSharpCode.ILSpy.GeneratePdbContextMenuEntry.GeneratePdbForAssembly(LoadedAssembly assembly) in /home/runner/work/AvaloniaILSpy/AvaloniaILSpy/ILSpy.Core/Commands/GeneratePdbContextMenuEntry.cs:line 60
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__139_0(Object state)
   at Avalonia.Threading.AvaloniaSynchronizationContext.<>c__DisplayClass5_0.<Post>b__0() in /_/src/Avalonia.Base/Threading/AvaloniaSynchronizationContext.cs:line 33
   at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) in /_/src/Avalonia.Base/Threading/JobRunner.cs:line 37
   at Avalonia.X11.X11PlatformThreading.HandleX11(CancellationToken cancellationToken)
   at Avalonia.X11.X11PlatformThreading.RunLoop(CancellationToken cancellationToken) in /_/src/Avalonia.X11/X11PlatformThreading.cs:line 245
   at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) in /_/src/Avalonia.Base/Threading/Dispatcher.cs:line 62
   at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 117
   at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 148
   at ICSharpCode.ILSpy.Program.Main(String[] args) in /home/runner/work/AvaloniaILSpy/AvaloniaILSpy/ILSpy/Program.cs:line 22