I had the same crash problem with a package I defined and use locally, and using that build system solved it (the documentation mentions the phase "glib-or-gtk-compile-schemas" which should take care of it).

(I tried to do this on my own, but I've never been able to build libreoffice locally yet: it always fails at the end for some reason.)

[1]: https://www.gnu.org/software/guix/manual/guix.html#index-glib_002dor_002dgtk_002dbuild_002dsystem