wxDebug error when adding predefined trace size PCB Editor

Description

Attempt to add a predefined trace with to the Board Setup. Clicking OK results in an Debug error

Steps to reproduce

1. Open board setup by clicking the "Board Setup" icon
2. Open "Pre-defined sizes" under "Design rules"
3. Add a predefined size (I used a size of 5mm)
4. Click OK
5. Debug error window pops up

KiCad Version

Application: KiCad PCB Editor

Version: (5.99.0-10195-g3450610977), debug build

Libraries:
	wxWidgets 3.1.4
	libcurl/7.74.0-DEV Schannel zlib/1.2.11

Platform: Windows 10 (build 19042), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Apr 10 2021 21:04:38
	wxWidgets: 3.1.4 (wchar_t,STL containers)
	Boost: 1.75.0
	OCC: 7.4.0
	Curl: 7.74.0-DEV
	ngspice: 32
	Compiler: Visual C++ 1928 without C++ ABI

Build settings:
	KICAD_SCRIPTING=OFF
	KICAD_SCRIPTING_MODULES=OFF
	KICAD_SCRIPTING_PYTHON3=OFF
	KICAD_SCRIPTING_WXPYTHON=OFF
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
	KICAD_SCRIPTING_ACTION_MENU=OFF
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON
	KICAD_STDLIB_DEBUG=OFF
	KICAD_STDLIB_LIGHT_DEBUG=OFF
	KICAD_SANITIZE=OFF