Kicad PCB Editor crashed when differential routing initiated.
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# Description
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# Steps to reproduce
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1.
# KiCad Version
```
Application: KiCad x86_64 on x86_64
Version: 7.99.0-unknown-18cebe3779~170~ubuntu22.04.1, release build
Libraries:
wxWidgets 3.2.1
FreeType 2.11.1
HarfBuzz 2.7.4
FontConfig 2.13.1
Platform: KDE neon 5.27, 64 bit, Little endian, wxGTK, KDE, x11
wxWidgets: 3.2.1 (wchar_t,wx containers) GTK+ 3.24
Boost: 1.74.0
OCC: 7.5.2
Curl: 7.81.0
ngspice: 38
Compiler: GCC 11.3.0 with C++ ABI 1016
Build settings:
```
issue