Crash when clicking on settings button of "New Game" window

[Spenk009]

"veh-management-new", self compiled on the 04.01.2021.
When I tried to open the settings window for a new game it crashed. I believe I saw someone posting an error like it, but as the gui is still under works, I thought I'd only mention it. It doesn't look like it has to do with the scheduling changes.

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~/simutrans-ex/simutrans-extended
Using data directory /home/jezzer/simutrans-ex/
Reading low level config data ...
Parsed simuconf.tab for directory layout; multiuser = 0
parse_simuconf() at config/simuconf.tab: Reading simuconf.tab successful!
Init done.
parse_colours() at config/simuconf.tab: Pak found: Pak128.Britain-Ex/
Reading simuconf.tab successful!
Calculating textures ...done
simutrans-extended: gui/components/gui_aligned_container.cc:494: void gui_aligned_container_t::end_table(): Assertion `child != NULL' failed.
Aborted (core dumped)