Hi, The following non-minimum example results in a core dump, when I process it using 2.25.7 in Linux, it doesn't crash with 2.24.2. I've attempted to cut it down to a smaller example, but as soon as I comment out some lines from partI, it doesn't crash.
As you can guess, the equivalence of the empty \partII in my actual score, is just included as a template to be filled in later, but I certainly want to be able to process it in this state without crashing. Removing \partII from the score gives the desired output. \version "2.25.7" partI = \relative c' { \repeat volta 2 { c8. 16 e8. 16 g8. 16 c8. 16 | \afterGrace g'1-\trill ( {f16 g ) } | a8. f16 a8. f16 a8. f16 d8. a16 | b8. d16 g8. fis16 \acciaccatura fis8 g2 | g,,8. 16 b8. 16 d8. 16 g8. 16 | \afterGrace d'1-\trill ( {c16 d ) } | e4.-! a,8 4.-\trill ( g16 a ) | fis'4.-! b,8 4.-\trill ( a16 b ) | g'4.-! e8 gis4.-\trill ( fis16 gis ) | a4 a,8. b16 c8. d16 \grace d8 e4 | d-! r c-! r | bes r r2 | a8. g16 a8. b16 c8. b16 c8. d16 | b8. a16 b8. c16 d8. c16 d8. e16 | c16-! ( d e8 ) c16-! ( d e8 ) c16-! ( d e8 ) c16-! ( d e8 ) | \grace g,8 fis4 e8 d g16 ( fis8. ) e16 ( d8. ) | d'4-! c-! r8 b c8. a16 | b8. g'16 fis8. g16 fis8. g16 fis8. g16 | a,16 ( b c8 ) b8. g16 \grace b8 a2-\trill | \alternative{ \volta 1 { g1 | } \volta 2 { \time 12/8 \tempo "Allegro" g4 r8 r4 r8 r2. |}}} \repeat volta 2 { } } partII = \fixed c' { \repeat volta 2 { \alternative{ \volta 1 { } \volta 2 { \time 12/8 \tempo "Allegro" }}} \repeat volta 2 { }} \score{ \new StaffGroup << \new Staff \partI \new Staff \partII >> } /Mats