GLib-GObject-WARNING **: /build/... type id '0' is invalid

GLib-GObject-WARNING **: /build/glib2.0-ctZcLv/glib2.0-2.44.1/./gobject/gtype.c:4268: type id '0' is invalid
ending with a segmentation fault => The theme used is not compatible with the gtk3 library used.

You can change the theme with `lxappearence` and `sudo lxappearence#for root applications`

Is you want something close to the waldorf theme, greybird is what you are looking for.