Comment 2 for bug 1214204

StacktraceTop:
 g_type_check_instance_is_a (type_instance=type_instance@entry=0x7f73b8002000, iface_type=iface_type@entry=80) at /build/buildd/glib2.0-2.37.5/./gobject/gtype.c:3975
 g_object_ref (_object=0x7f73b8002000) at /build/buildd/glib2.0-2.37.5/./gobject/gobject.c:3054
 g_list_foreach (list=<optimized out>, list@entry=0x1302b80, func=0x404bd0 <g_object_ref@plt>, user_data=user_data@entry=0x0) at /build/buildd/glib2.0-2.37.5/./glib/glist.c:949
 g_vfs_afc_volume_monitor_get_volumes (_self=<optimized out>) at afcvolumemonitor.c:153
 handle_list (object=0x130b270, invocation=0x7f73b000a4f0, user_data=<optimized out>) at gvfsproxyvolumemonitordaemon.c:936