Doom Builder 2 r1416 GZDoom visual mode Unhandled Exception

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

************** Exception Text **************
System.InvalidOperationException: Failed to compare two elements in the array. ---> System.ArithmeticException: Function does not accept floating point Not-a-Number values.
   at System.Math.Sign(Single value)
   at CodeImp.DoomBuilder.GZDoomEditing.SectorLevelComparer.Compare(SectorLevel x, SectorLevel y)
   at System.Collections.Generic.ArraySortHelper`1.SwapIfGreaterWithItems(T[] keys, IComparer`1 comparer, Int32 a, Int32 b)
   at System.Collections.Generic.ArraySortHelper`1.QuickSort(T[] keys, Int32 left, Int32 right, IComparer`1 comparer)
   at System.Collections.Generic.ArraySortHelper`1.Sort(T[] keys, Int32 index, Int32 length, IComparer`1 comparer)
   --- End of inner exception stack trace ---
   at System.Collections.Generic.ArraySortHelper`1.Sort(T[] keys, Int32 index, Int32 length, IComparer`1 comparer)
   at System.Array.Sort[T](T[] array, Int32 index, Int32 length, IComparer`1 comparer)
   at System.Collections.Generic.List`1.Sort(Int32 index, Int32 count, IComparer`1 comparer)
   at CodeImp.DoomBuilder.GZDoomEditing.SectorData.Update()
   at CodeImp.DoomBuilder.GZDoomEditing.VisualUpper.Setup()
   at CodeImp.DoomBuilder.GZDoomEditing.BaseVisualSector.Rebuild()
   at CodeImp.DoomBuilder.GZDoomEditing.BaseVisualSector..ctor(BaseVisualMode mode, Sector s)
   at CodeImp.DoomBuilder.GZDoomEditing.BaseVisualMode.CreateVisualSector(Sector s)
   at CodeImp.DoomBuilder.VisualModes.VisualMode.ProcessSidedefCulling(Sidedef sd)
   at CodeImp.DoomBuilder.VisualModes.VisualMode.DoCulling()
   at CodeImp.DoomBuilder.VisualModes.VisualMode.OnProcess(Double deltatime)
   at CodeImp.DoomBuilder.GZDoomEditing.BaseVisualMode.OnProcess(Double deltatime)
   at CodeImp.DoomBuilder.Windows.MainForm.processor_Tick(Object sender, EventArgs e)
   at System.Windows.Forms.Timer.OnTick(EventArgs e)
   at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4952 (win7RTMGDR.050727-4900)
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
Builder
    Assembly Version: 2.1.0.0
    Win32 Version: 2.1.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Builder.exe
----------------------------------------
System
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
SlimDX
    Assembly Version: 2.0.7.41
    Win32 Version:
    CodeBase: file:///C:/Windows/assembly/GAC_32/SlimDX/2.0.7.41__b1b0c32fd1ffe4f9/SlimDX.dll
----------------------------------------
msvcm80
    Assembly Version: 8.0.50727.4927
    Win32 Version: 8.00.50727.4927
    CodeBase: file:///C:/Windows/WinSxS/x86_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.4927_none_d08a205e442db5b5/msvcm80.dll
----------------------------------------
BuilderModes
    Assembly Version: 2.1.0.0
    Win32 Version: 2.1.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/BuilderModes.dll
----------------------------------------
CommentsPanel
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/CommentsPanel.dll
----------------------------------------
CopyPasteSectorProps
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/CopyPasteSectorProps.dll
----------------------------------------
GZDoomEditing
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/GZDoomEditing.dll
----------------------------------------
Statistics
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/Statistics.dll
----------------------------------------
TagRange
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/TagRange.dll
----------------------------------------
USDF
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Plugins/USDF.dll
----------------------------------------
System.Design
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Design/2.0.0.0__b03f5f7f11d50a3a/System.Design.dll
----------------------------------------
TrackBar
    Assembly Version: 1.0.2486.37933
    Win32 Version: 1.0.2486.37933
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/TrackBar.DLL
----------------------------------------
Sharpzip
    Assembly Version: 0.85.2.329
    Win32 Version: 0.85.2.329
    CodeBase: file:///C:/Program%20Files/Doom%20Builder%202/Sharpzip.DLL
----------------------------------------

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