thunar-4.15.0 hangs when closing windows using shortcut keys

When closing a thunar window using the assigned shortcut key, thunar sometimes hangs. This happens with 4.15.0, and 442461b1 seems to partly fix it (though I am not 100% sure it really does).

I can however still reproduce the issue rather easily when running thunar --daemon, opening a few windows and then closing them rapidly using the shortcut key; holding down the shortcut key combination is enough to achieve this. It then spills the console with messages like the following:

(thunar:17804): Gtk-CRITICAL **: 23:48:04.072: gtk_accel_group_activate: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed