Comment 2 for bug 1197645

StacktraceTop:
 g_object_ref (_object=_object@entry=0x90e44b8) at /build/buildd/glib2.0-2.37.3/./gobject/gobject.c:3054
 g_weak_ref_get (weak_ref=weak_ref@entry=0xb461d338) at /build/buildd/glib2.0-2.37.3/./gobject/gobject.c:4237
 cal_client_emit_backend_property_changed_idle_cb (user_data=user_data@entry=0xb461d338) at e-cal-client.c:445
 g_idle_dispatch (source=source@entry=0x90fd188, callback=0xb76da780 <cal_client_emit_backend_property_changed_idle_cb>, user_data=0xb461d338) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:5235
 g_main_dispatch (context=0x90ccb80) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3058