Issue 4767: Crash with Completion_heads_engraver and bare durations

This checks for the existence of a pitch before using it, defaulting
to middle C.

diff --git a/lily/completion-note-heads-engraver.cc b/lily/completion-note-heads-engraver.cc
index c88e4cccc1e8f6f391937e9a87cca340a1ab6a06..34a985d32da3cd1b16f2dda5e7bb2ff5a93fd5b2 100644 (file)
--- a/lily/completion-note-heads-engraver.cc
+++ b/lily/completion-note-heads-engraver.cc
@@ -164,7 +164,7 @@ Completion_heads_engraver::make_note_head (Stream_event *ev)
   Item *note = make_item ("NoteHead", ev->self_scm ());
   Pitch *pit = unsmob<Pitch> (ev->get_property ("pitch"));
 
-  int pos = pit->steps ();
+  int pos = pit ? pit->steps () : 0;
   SCM c0 = get_property ("middleCPosition");
   if (scm_is_number (c0))
     pos += scm_to_int (c0);