#0  0x0026c69c in g_type_check_instance_cast (type_instance=0xb6c07b48, 
    iface_type=80) at /build/buildd/glib2.0-2.27.93/gobject/gtype.c:1766
	node = (TypeNode *) 0x0
	iface = (TypeNode *) 0xa00dd40
	is_instantiatable = <value optimized out>
	check = <value optimized out>
#1  0x06bde9aa in widget_notify_cb (widget=0xb6c07b48, pspec=0xa00dd40, 
    data=0x159779)
    at /build/buildd/libdbusmenu-0.3.96/./libdbusmenu-gtk/parser.c:119
	parent = <value optimized out>
	child = (DbusmenuMenuitem *) 0x159779
#2  0xb6c07b48 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)