Comment 2 for bug 861496

StacktraceTop:
 g_settings_backend_watch (backend=0x0, vtable=<optimized out>, target=<optimized out>, context=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gio/gsettingsbackend.c:249
 g_delayed_settings_backend_new (backend=0x0, owner=0x7f6664166e80, owner_context=0x7f6663e7af90) at /build/buildd/glib2.0-2.30.0/./gio/gdelayedsettingsbackend.c:489
 g_settings_delay (settings=0x7f6664166e80) at /build/buildd/glib2.0-2.30.0/./gio/gsettings.c:2100
 cc_background_panel_init (self=0x7f6663e6a5c0) at cc-background-panel.c:1293
 g_type_create_instance (type=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gtype.c:1885