Assertion failed

[Andrew Bernard]

Using 2.19.30, hoping to avoid the core dumps from 2.19.29, I get the following 
error on my moderately large score:

Preprocessing graphical objects...lilypond: 
/home/gub/NewGub/gub/target/linux-64/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/flower/include/interval.hh:227:
 T Interval_t<T>::center() const [with T = double]: Assertion `!is_empty ()' 
failed.
Exited with exit status 1.

There is no line number indication and the score will not compile. Due to the 
massive complexity of my score, a binary chop is difficult and very time 
consuming. Has anybody seen this error? There was an issue like this a few 
releases ago related to nested tuplets I seem to recall.

Andrew