Comment 2 for bug 1018096

StacktraceTop:
 g_object_constructor (type=<optimized out>, n_construct_properties=0, construct_params=0x0) at /build/buildd/glib2.0-2.33.3/./gobject/gobject.c:1854
 g_object_newv (object_type=object_type@entry=9465632, n_parameters=n_parameters@entry=0, parameters=parameters@entry=0x0) at /build/buildd/glib2.0-2.33.3/./gobject/gobject.c:1637
 g_object_new (object_type=9465632, first_property_name=first_property_name@entry=0x0) at /build/buildd/glib2.0-2.33.3/./gobject/gobject.c:1547
 calendar_sources_get () at calendar-server/calendar-sources.c:266
 app_new (connection=0x909820) at calendar-server/gnome-shell-calendar-server.c:730