Comment 2 for bug 1222088

StacktraceTop:
 g_type_check_instance_is_a (type_instance=type_instance@entry=0xb8b4d7b0, iface_type=iface_type@entry=3094646640) at /build/buildd/glib2.0-2.37.6/./gobject/gtype.c:3975
 go_option_menu_select_item (option_menu=option_menu@entry=0xb88e6190, item=0xb8b51ae8) at gtk/go-optionmenu.c:131
 go_option_menu_set_menu (option_menu=0xb88e6190, menu=menu@entry=0xb8b46880) at gtk/go-optionmenu.c:336
 reload_faces (gfs=gfs@entry=0xb8ae0088) at gtk/go-font-sel.c:359
 go_font_sel_set_family (fs=fs@entry=0xb8ae0088, font_name=0xb8b54638 "Ubuntu") at gtk/go-font-sel.c:1440