#0  0x00567078 in g_type_check_instance_is_a (type_instance=0x909ecc8, 
    iface_type=150148952)
    at /build/buildd/glib2.0-2.27.92/gobject/gtype.c:1766
	node = (TypeNode *) 0x20090000
	iface = (TypeNode *) 0x8f31758
	check = 0
#1  0x0083cf6c in g_variant_unlock (value=Unhandled dwarf expression opcode 0x9f
)
    at /build/buildd/glib2.0-2.27.92/glib/gvariant-core.c:232
No locals.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)