Comment #3 on issue 3041 by [email protected]: Patch: Fix a few segfaulting cases in hara-kiri-group-spanner
http://code.google.com/p/lilypond/issues/detail?id=3041
Please include this patch in yours - it seems currently triggers an assertion error for issue 3040 at the engraving stage. This check will help from problems like this introducing themselves in the future.
