Theme Extras crashes Playnite in custom theme

[azuravian]

I'm working through a custom theme and wanted to add icons to links as provided by the ThemeExtras_Links content control.

As opposed to the vertical list presented, I made a horizontal stackpanel to hold the items. For the most part, this works fine, but whenever I do certain functions (usually related to other plugins) Theme Extras crashes Playnite with the Whoops message.

My Grid for ThemeExtras_Links looks like this:

<Grid Margin="0,10,0,5" Height="35" Background="{DynamicResource NormalBrushDark}">
	<ContentControl x:Name="ThemeExtras_Links"
					Visibility="{PluginStatus Plugin=felixkmh_Extras_Plugin, Status=Installed}">
		<ContentControl.Resources>
			<Style TargetType="ItemsControl">
				<Setter Property="ItemsPanel">
					<Setter.Value>
						<ItemsPanelTemplate>
							<StackPanel Orientation="Horizontal"/>
						</ItemsPanelTemplate>
					</Setter.Value>
				</Setter>
				<Setter Property="ItemTemplate">
					<Setter.Value>
						<DataTemplate>
							<DockPanel Margin="5">
								<Viewbox DockPanel.Dock="Left" Margin="0,0,5,0" Width="18" Height="18">
									<ContentControl>
										<ContentControl.Content>
											<Binding Path="Icon">
												<Binding.TargetNullValue>
													<TextBlock Text="&#xEF71;" 
															   Style="{DynamicResource BaseTextBlockStyle}" 
															   FontFamily="{StaticResource FontIcoFont}"/>
												</Binding.TargetNullValue>
											</Binding>
										</ContentControl.Content>
									</ContentControl>
								</Viewbox>
								<TextBlock DockPanel.Dock="Left" 
										   VerticalAlignment="Center" 
										   TextTrimming="CharacterEllipsis"
										   ToolTip="{Binding Url}" Margin="0,0,10,0">
									<Hyperlink Command="{Binding OpenLinkCommand}">
										<Run Text="{Binding Name}"/>
									</Hyperlink>    
								</TextBlock>
							</DockPanel>
						</DataTemplate>
					</Setter.Value>
				</Setter>
			</Style>
		</ContentControl.Resources>
	</ContentControl>
</Grid>

I have also attached two crash reports from Playnite, one crashed when using the "Copy Info to other Copies" function in DuplicateHider, the other when downloading SuccessStory Achievements for a game.

The crashes always occur after the other function is completed and control of the UI is going back to the user.
Theme_Extras_Crash_SS.zip
Theme_Extras_Crash_DH.zip