* lily/slur-scoring.cc (move_away_from_staffline): robustness,

[lilypond.git] / lily / slur-scoring.cc

diff --git a/lily/slur-scoring.cc b/lily/slur-scoring.cc
index 9b005386c4153c8ffcdf2338988d913bd9b2377b..22248890e83e801f2f1ae6e054455f26104721f4 100644 (file)
--- a/lily/slur-scoring.cc
+++ b/lily/slur-scoring.cc
@@ -598,8 +598,12 @@ Real
 Slur_score_state::move_away_from_staffline (Real y,
                                            Grob *on_staff) const
 {
+  Grob * staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
+  if (!staff_symbol)
+    return y;
+  
   Real pos
-    = (y - Staff_symbol_referencer::get_staff_symbol (on_staff)->relative_coordinate (common_[Y_AXIS],
+    = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
                                                                                      Y_AXIS))
     * 2.0 / staff_space_;