Grob *last_spacing = last_spacings_[parent];
if (last_spacing
- && !Grob_array::unsmob (last_spacing->get_object ("right-items")))
+ && !Grob_array::is_smob (last_spacing->get_object ("right-items")))
{
Grob *col = Grob::unsmob (get_property ("currentCommandColumn"));