==1731== ERROR: AddressSanitizer: heap-use-after-free on address 0x60220038e400 at pc 0x913f57 bp 0x7fff5e4be3e0 sp 0x7fff5e4be3d8
READ of size 8 at 0x60220038e400 thread T0
    #0 0x913f56 in Ms::Element::score() const /home/antonio/MuseScore/libmscore/element.h:326
    #1 0x1275c37 in Ms::AddElement::undo() /home/antonio/MuseScore/libmscore/undo.cpp:1258
    #2 0x126cdd4 in Ms::UndoCommand::undo() /home/antonio/MuseScore/libmscore/undo.cpp:127
    #3 0x126db5a in Ms::UndoStack::undo() /home/antonio/MuseScore/libmscore/undo.cpp:295
    #4 0xab29b8 in Ms::MuseScore::undo() /home/antonio/MuseScore/mscore/musescore.cpp:2910
    #5 0xabc42d in Ms::MuseScore::cmd(QAction*, QString const&) /home/antonio/MuseScore/mscore/musescore.cpp:4008
    #6 0xabb069 in Ms::MuseScore::cmd(QAction*) /home/antonio/MuseScore/mscore/musescore.cpp:3860
    #7 0x8a7789 in Ms::MuseScore::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/antonio/MuseScore/build.debug/mscore/moc_musescore.cpp:813
    #8 0x7ffda16a4260 in ?? ??:0
    #9 0x7ffd9f8b24ce in ?? ??:0
    #10 0x7ffd9f8b2ca8 in ?? ??:0
    #11 0x7ffda16a4260 in ?? ??:0
    #12 0x7ffd9f8aeba1 in ?? ??:0
    #13 0x7ffd9f8b09d6 in ?? ??:0
    #14 0x7ffd9f8b0cce in ?? ??:0
    #15 0x7ffd9f8b9b53 in ?? ??:0
    #16 0x7ffd9f8bcfe5 in ?? ??:0
    #17 0x7ffda167cdd3 in ?? ??:0
    #18 0x7ffda0ec7e90 in ?? ??:0
    #19 0x7ffda0ec8d89 in ?? ??:0
    #20 0x7ffd9f8bcf87 in ?? ??:0
    #21 0x7ffda167cdd3 in ?? ??:0
    #22 0x7ffda0e9d713 in ?? ??:0
    #23 0x7ffda0ea692c in ?? ??:0
    #24 0x7ffda0e8fa97 in ?? ??:0
    #25 0x7ffd9271f93f in ?? ??:0
    #26 0x7ffd998d2d52 in ?? ??:0
    #27 0x7ffd998d309f in ?? ??:0
    #28 0x7ffd998d3163 in ?? ??:0
    #29 0x7ffda16c7313 in ?? ??:0
    #30 0x7ffda167bb6a in ?? ??:0
    #31 0x7ffda167fbbd in ?? ??:0
    #32 0xac3c83 in main /home/antonio/MuseScore/mscore/musescore.cpp:4933
    #33 0x7ffd9b29676c in __libc_start_main /build/buildd/eglibc-2.15/csu/libc-start.c:226
    #34 0x8a2ad8 in _start ??:0
0x60220038e400 is located 160 bytes inside of 224-byte region [0x60220038e360,0x60220038e440)

freed by thread T0 here:
    #0 0x7ffda221ab1a in ?? ??:0
    #1 0x1320d31 in Ms::StemSlash::~StemSlash() /home/antonio/MuseScore/build.debug/libmscore/../../libmscore/stemslash.h:26
    #2 0x1078309 in Ms::Chord::setStemSlash(Ms::StemSlash*) /home/antonio/MuseScore/libmscore/chord.cpp:2277
    #3 0x104cb35 in Ms::Beam::layout2(QList<Ms::ChordRest*>, Ms::SpannerSegmentType, int) /home/antonio/MuseScore/libmscore/beam.cpp:1744
    #4 0x103a29d in Ms::Beam::layout() /home/antonio/MuseScore/libmscore/beam.cpp:448
    #5 0x111c67f in Ms::Score::doLayout() /home/antonio/MuseScore/libmscore/layout.cpp:640
    #6 0x128c2bd in Ms::Score::endCmd() /home/antonio/MuseScore/libmscore/cmd.cpp:121
    #7 0xabb0f0 in Ms::MuseScore::cmd(QAction*) /home/antonio/MuseScore/mscore/musescore.cpp:3862
    #8 0x8a7789 in Ms::MuseScore::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/antonio/MuseScore/build.debug/mscore/moc_musescore.cpp:813
    #9 0x7ffda16a4260 in ?? ??:0

previously allocated by thread T0 here:
    #0 0x7ffda221a95a in ?? ??:0
    #1 0x106da27 in Ms::Chord::layoutStem1() /home/antonio/MuseScore/libmscore/chord.cpp:1175
    #2 0x1146dd4 in Ms::Measure::layoutCR0(Ms::ChordRest*, double) /home/antonio/MuseScore/libmscore/measure.cpp:345
    #3 0x1146b60 in Ms::Measure::layoutCR0(Ms::ChordRest*, double) /home/antonio/MuseScore/libmscore/measure.cpp:327
    #4 0x114691c in Ms::Measure::layoutChords0(Ms::Segment*, int) /home/antonio/MuseScore/libmscore/measure.cpp:306
    #5 0x115f404 in Ms::Measure::layoutStage1() /home/antonio/MuseScore/libmscore/measure.cpp:3365
    #6 0x111bf88 in Ms::Score::doLayout() /home/antonio/MuseScore/libmscore/layout.cpp:607
    #7 0x128c2bd in Ms::Score::endCmd() /home/antonio/MuseScore/libmscore/cmd.cpp:121
    #8 0xabb0f0 in Ms::MuseScore::cmd(QAction*) /home/antonio/MuseScore/mscore/musescore.cpp:3862
    #9 0x8a7789 in Ms::MuseScore::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/antonio/MuseScore/build.debug/mscore/moc_musescore.cpp:813
    #10 0x7ffda16a4260 in ?? ??:0

Shadow bytes around the buggy address:
  0x0c04c0069c30: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa
  0x0c04c0069c40: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c04c0069c50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c04c0069c60: fd fa fa fa fa fa fa fa fa fa fa fa fd fd fd fd
  0x0c04c0069c70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c04c0069c80:[fd]fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x0c04c0069c90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c04c0069ca0: fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa
  0x0c04c0069cb0: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c04c0069cc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa
  0x0c04c0069cd0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:     fa
  Heap righ redzone:     fb
  Freed Heap region:     fd
  Stack left redzone:    f1
  Stack mid redzone:     f2
  Stack right redzone:   f3
  Stack partial redzone: f4
  Stack after return:    f5
  Stack use after scope: f8
  Global redzone:        f9
  Global init order:     f6
  Poisoned by user:      f7
  ASan internal:         fe
==1731== ABORTING