Completion_heads_engraver produces segmentation fault

[ornello]

The following LY produces a segmentation fault:

\version "2.12.3"

\layout {
\context {
\Voice
\remove "Note_heads_engraver"
\consists "Completion_heads_engraver"
}
}

{
e'16 ~
< e' b' > 4
}

Does anybody know a workaround or quickfix?

Thanks for any advice...

..........................

Here is the stack trace:

#0  0xb7f10024 in scm_is_pair (key=0xb6d1bbd0, alist=0x85ed738) at
../libguile/inline.h:305
#1  scm_sloppy_assq (key=0xb6d1bbd0, alist=0x85ed738) at alist.c:60
#2  0x08215fc1 in Prob::internal_get_property (this=0xb7ae23d0,
sym=0xb6d1bbd0) at prob.cc:152
#3  0x080b7fe0 in Completion_heads_engraver::process_music (this=0x85e62c0)
at completion-note-heads-engraver.cc:223
#4  0x082ea271 in Translator_method_binding::invoke (c=0x85e56f0,
idx=PROCESS_MUSIC, dir=UP) at ./include/translator-group.hh:35
#5  Translator_group::precomputed_translator_foreach (c=0x85e56f0,
idx=PROCESS_MUSIC, dir=UP) at translator-group.cc:280
#6  precomputed_recurse_over_translators (c=0x85e56f0, idx=PROCESS_MUSIC,
dir=UP) at translator-group.cc:211
#7  0x082ea1b6 in precomputed_recurse_over_translators (c=0x85e42e0,
idx=PROCESS_MUSIC, dir=UP) at translator-group.cc:207
#8  0x082ea1b6 in precomputed_recurse_over_translators (c=0x8550450,
idx=PROCESS_MUSIC, dir=UP) at translator-group.cc:207
#9  0x0823eee6 in Score_engraver::one_time_step (self=0x85510c8,
ev=0xb73ea160) at score-engraver.cc:140
#10 Score_engraver::one_time_step_callback (self=0x85510c8, ev=0xb73ea160)
at score-engraver.cc:134
#11 0x080d66df in Dispatcher::dispatch (this=0x846e7e0, sev=0xb73ea160) at
dispatcher.cc:139
#12 0x080c92b4 in Context::internal_send_stream_event (this=0x85deeac,
type=0xb6d38e70, origin=0x0, props=0xbfffc208)
    at context.cc:450
#13 0x081158e3 in Global_context::run_iterator_on_me (this=0x85dee48,
iter=0x85df460) at global-context.cc:159
#14 0x08113f51 in ly_interpret_music_expression (mus=0xb73448c0,
ctx=0xb73a6630) at global-context-scheme.cc:108
#15 0x081145a9 in ly_run_translator (mus=0xb73448c0, output_def=0xb736ae90)
at global-context-scheme.cc:136
#16 0x082457ce in Score::book_rendering (this=0x85ddf38,
layoutbook=0x85ddfd0, default_def=0x85dca48) at score.cc:146
#17 0x0809d600 in Book::process_score (this=0x85ddf98, s=0xb736aed0,
output_paper_book=0x85dc9f8, layout=0x85ed738) at book.cc:219
#18 0x0809eb7e in Book::process (this=0x85ddf98, default_paper=0x84dd480,
default_layout=0x85dca48, parent_part=0x0) at book.cc:283
#19 0x0809eda7 in Book::process (this=0x85ddf98, default_paper=0x84dd480,
default_layout=0x85dca48) at book.cc:190
#20 0x0809cd13 in ly_book_process (book_smob=0xb734a920,
default_paper=0xb6ffb738, default_layout=0xb72d8df0, output=0xb6bd74a0)
    at book-scheme.cc:65
...

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