crash when running "Add/Remove Line Breaks" against score or part with multi-measure rests turned on

Open attached file, select a part and run the "Add/Remove Line Breaks" tool against it, to add a line break every 4 measures
--> crash

Original report: https://musescore.org/en/node/59156

Stack trace:
0 QListData::isEmpty qlist.h 93 0xbe0c28
1 QList::isEmpty qlist.h 158 0xbcc01b
2 Ms::System::lastMeasure system.cpp 807 0x7c235a
3 Ms::ScoreView::cmdAddRemoveBreaks scoreview.cpp 5892 0x41e40d
4 Ms::ScoreView::cmd scoreview.cpp 3013 0x411bb6
5 Ms::MuseScore::cmd musescore.cpp 4240 0x4932ca
6 Ms::MuseScore::cmd musescore.cpp 3885 0x4915e6
7 Ms::MuseScore::qt_static_metacall moc_musescore.cpp 810 0x69eab4
8 ZN11QMetaObject8activateEP7QObjectiiPPv 0x68a64e31
9 Ms::ScoreTab::actionTriggered moc_scoretab.cpp 189 0x6a4951
10 Ms::ScoreTab::qt_static_metacall moc_scoretab.cpp 94 0x6a4627
11 ZN11QMetaObject8activateEP7QObjectiiPPv 0x68a64e31
12 ZN12QActionGroup7hoveredEP7QAction 0x61dc4b95
13 ?? 0x1e49d870
14 ZN7QAction8activateENS_11ActionEventE 0x61dc3b6e
15 ?? 0x28cd78
16 ?? 0x24748b04

Workaround: switch off multi-measure rests before running the tool (and back on after)
or just select measures not including mm-rests

A fix should probably count each mm-rest as one measure