Hi, attached is a minimal example that causes a crash in lilypond 2.19.82.
Output: GNU LilyPond 2.19.82 »assertion_test.ly« wird verarbeitet Analysieren... Interpretation der Musik... Vorverarbeitung der grafischen Elemente.../home/gub/NewGub/gub/target/darwin-x86/src/lilypond-git.sv.gnu.org--lilypond.git-stable-2.20/flower/include/interval.hh:227: failed assertion `!is_empty ()' Abort trap: 6 Hope this is helpful. Best Hendrik
assertion_test.ly
Description: Binary data
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