StacktraceTop: g_type_check_instance_cast (type_instance=0x20a3ef0, iface_type=37110608) at /build/buildd/glib2.0-2.28.5/./gobject/gtype.c:3994 bamf_factory_view_for_path (factory=0x21e1ec0, path=0x2f7fca0 "/org/ayatana/bamf/application0xeb6f20") at bamf-factory.c:203 bamf_matcher_on_view_opened (proxy=<value optimized out>, path=0x2f7fca0 "/org/ayatana/bamf/application0xeb6f20", type=<value optimized out>, matcher=0x1f5d940) at bamf-matcher.c:128 marshal_dbus_message_to_g_marshaller (closure=0x20f8c10, return_value=0x0, n_param_values=<value optimized out>, param_values=<value optimized out>, invocation_hint=0x7fff0a8b4430, marshal_data=0x0) at dbus-gproxy.c:1681 g_closure_invoke (closure=0x20f8c10, return_value=0x0, n_param_values=3, param_values=0x242d540, invocation_hint=0x7fff0a8b4430) at /build/buildd/glib2.0-2.28.5/./gobject/gclosure.c:767
StacktraceTop: check_instance_ cast (type_instance= 0x20a3ef0, iface_type= 37110608) at /build/ buildd/ glib2.0- 2.28.5/ ./gobject/ gtype.c: 3994 view_for_ path (factory=0x21e1ec0, path=0x2f7fca0 "/org/ayatana/ bamf/applicatio n0xeb6f20" ) at bamf-factory.c:203 on_view_ opened (proxy=<value optimized out>, path=0x2f7fca0 "/org/ayatana/ bamf/applicatio n0xeb6f20" , type=<value optimized out>, matcher=0x1f5d940) at bamf-matcher.c:128 dbus_message_ to_g_marshaller (closure=0x20f8c10, return_value=0x0, n_param_ values= <value optimized out>, param_values=<value optimized out>, invocation_ hint=0x7fff0a8b 4430, marshal_data=0x0) at dbus-gproxy.c:1681 0x242d540, invocation_ hint=0x7fff0a8b 4430) at /build/ buildd/ glib2.0- 2.28.5/ ./gobject/ gclosure. c:767
g_type_
bamf_factory_
bamf_matcher_
marshal_
g_closure_invoke (closure=0x20f8c10, return_value=0x0, n_param_values=3, param_values=