- iv *= Staff_symbol::staff_space (ss) / 2.0;
-
- heads.unite (iv + ss->relative_coordinate (common, Y_AXIS)
- - my_y);
+ iv *= Staff_symbol_referencer::staff_space (me) / 2.0;
+ Real staff_y = ss ? ss->relative_coordinate (common, Y_AXIS) : 0.0;
+ heads.unite (iv + staff_y - my_y);