From 0ab926218d76fa487f6935fd846796c902261e94 Mon Sep 17 00:00:00 2001
From: David Kastrup <dak@gnu.org>
Date: Mon, 8 Feb 2016 23:47:47 +0100
Subject: [PATCH] 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.
---
 lily/completion-note-heads-engraver.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lily/completion-note-heads-engraver.cc b/lily/completion-note-heads-engraver.cc
index c88e4cccc1..34a985d32d 100644
--- 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);
-- 
2.39.2