When opening the page for a specific site, an error happens.

[Uma410]

If you open the page of the castle "Honeytomb" in this legends export, an unhandled exception occurs, but the program can continue running as normal, it just won't open this specific page.

The error text says:
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at LegendsViewer.Legends.Events.EntityOverthrown.Print(Boolean link, DwarfObject pov)
at LegendsViewer.Controls.HTML.HtmlPrinter.PrintEventLog(World world, List1 events, List1 filters, DwarfObject dfo)
at LegendsViewer.Controls.HTML.SitePrinter.Print()
at LegendsViewer.Controls.HTML.HtmlPrinter.GetHtmlPage()
at LegendsViewer.Controls.HTML.HtmlControl.GetControl()
at LegendsViewer.Controls.DwarfTabPage.LoadPageControl()
at LegendsViewer.Controls.DwarfTabPage.NewPageControl(PageControl pageControl)
at LegendsViewer.Controls.DwarfTabControl.Navigate(ControlOption controlOption, Object navigateObject)
at LegendsViewer.Controls.Tabs.BaseSearchTab.ListSearch_SelectedIndexChanged(Object sender, EventArgs e)
at System.Windows.Forms.ListView.OnSelectedIndexChanged(EventArgs e)
at BrightIdeasSoftware.ObjectListView.OnSelectedIndexChanged(EventArgs e)
at System.Windows.Forms.ListView.WmReflectNotify(Message& m)
at System.Windows.Forms.ListView.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4515.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
LegendsViewer
Assembly Version: 1.20.8.375
Win32 Version: 1.20.08.375
CodeBase: file:///C:/Users/Bruno/Programme/Peridexis%20Errant's%20DF%20Starter%20Pack/LNP/Utilities/Legends%20Viewer/LegendsViewer.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4515.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4488.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4390.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4515.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4190.0 built by: NET48REL1LAST_B
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4084.0 built by: NET48REL1
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
ObjectListView
Assembly Version: 2.9.1.1072
Win32 Version: 2.9.1.0
CodeBase: file:///C:/Users/Bruno/Programme/Peridexis%20Errant's%20DF%20Starter%20Pack/LNP/Utilities/Legends%20Viewer/ObjectListView.DLL
----------------------------------------
SevenZipSharp
Assembly Version: 0.64.3890.29348
Win32 Version: 0.64.3890.29348
CodeBase: file:///C:/Users/Bruno/Programme/Peridexis%20Errant's%20DF%20Starter%20Pack/LNP/Utilities/Legends%20Viewer/SevenZipSharp.DLL
----------------------------------------
CommonMark
Assembly Version: 0.1.0.0
Win32 Version: 0.1.0.0
CodeBase: file:///C:/Users/Bruno/Programme/Peridexis%20Errant's%20DF%20Starter%20Pack/LNP/Utilities/Legends%20Viewer/CommonMark.DLL
----------------------------------------
Jdenticon
Assembly Version: 2.2.1.0
Win32 Version: 2.2.1.0
CodeBase: file:///C:/Users/Bruno/Programme/Peridexis%20Errant's%20DF%20Starter%20Pack/LNP/Utilities/Legends%20Viewer/Jdenticon.DLL
----------------------------------------
Jdenticon.Gdi
Assembly Version: 2.2.1.0
Win32 Version: 2.2.1.0
CodeBase: file:///C:/Users/Bruno/Programme/Peridexis%20Errant's%20DF%20Starter%20Pack/LNP/Utilities/Legends%20Viewer/Jdenticon.Gdi.DLL
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

[JakeTrans]

Can reproduce the error with this file

Looks to be a issue with EntityOverthrown.cs as the OverthrownHistoricalFigure is returning Null for this line

eventString += OverthrownHistoricalFigure.ToLink(link, pov, this);

creating a new instance of OverthrownHistoricalFigure does seem to prevent the crash