Comment 2 for bug 1186850

StacktraceTop:
 ido_calendar_menu_item_get_calendar (menuitem=0x1fd4860) at idocalendarmenuitem.c:351
 menu_visible_notify_cb (menu=<optimized out>, pspec=<optimized out>, user_data=<optimized out>) at indicator-datetime.c:286
 g_closure_invoke (closure=0x1f98620, return_value=0x0, n_param_values=2, param_values=0x7fff2a25a980, invocation_hint=0x7fff2a25a920) at /build/buildd/glib2.0-2.37.0/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=node@entry=0x1db2580, detail=detail@entry=96, instance=instance@entry=0x1f4e9b0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff2a25a980) at /build/buildd/glib2.0-2.37.0/./gobject/gsignal.c:3584
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fff2a25ab18) at /build/buildd/glib2.0-2.37.0/./gobject/gsignal.c:3328