Crash in redo when vertical box changes system

Steps:
1- Open attached score, or create an empty score;
2- Select the last measure, in this case measure 17;
3- Append vertical frame;
4- Add some measures to the score, so that a new system is generated (i.e. a new "line" is added to the score); for example, for the attached file, select measure 16 and insert 8 measures; the vertical frame is shifted to a new system accordingly;
5- Undo; everything is Ok;
6- Redo -> Crash

The error given is an "index out of range" for QList:
Fatal: ASSERT failure in QList::operator[]: "index out of range", file C:/Qt/4.8.4/include/QtCore/qlist.h,
line 477

MuseScore rev. c7a380c self-build, but also in Nightly build bd741c8
Windows XP Professional SP3