If I try to load it directly (skip the softwarelist) then I get the same crash. It tries to get parameters, but there aren't any if you load it directly.

mame.exe ggm -cart file.bin
Caught unhandled St11logic_error exception: basic_string::_M_construct null not valid

I fixed that crash.

You added a CPU frequency parameter, right? Maybe you forgot to add it to the new capa set? So, MAME tries to fetch the "mhz" string, but will crash if it's null.