ASAN:SIGSEGV
=================================================================
==5369== ERROR: AddressSanitizer: SEGV on unknown address 0x000000000068 (pc 0x00000124b813 sp 0x7fff44780650 bp 0x7fff44780660 T0)
AddressSanitizer can not provide additional info.
    #0 0x124b812 in std::_Rb_tree<int, std::pair<int const, Ms::TimeSig*>, std::_Select1st<std::pair<int const, Ms::TimeSig*> >, std::less<int>, std::allocator<std::pair<int const, Ms::TimeSig*> > >::_M_begin() /usr/include/c++/4.8/bits/stl_tree.h:502
    #1 0x124c4b3 in std::_Rb_tree<int, std::pair<int const, Ms::TimeSig*>, std::_Select1st<std::pair<int const, Ms::TimeSig*> >, std::less<int>, std::allocator<std::pair<int const, Ms::TimeSig*> > >::lower_bound(int const&) /usr/include/c++/4.8/bits/stl_tree.h:876
    #2 0x124ba5c in std::map<int, Ms::TimeSig*, std::less<int>, std::allocator<std::pair<int const, Ms::TimeSig*> > >::lower_bound(int const&) /usr/include/c++/4.8/bits/stl_map.h:863
    #3 0x124adf3 in std::map<int, Ms::TimeSig*, std::less<int>, std::allocator<std::pair<int const, Ms::TimeSig*> > >::operator[](int&&) /usr/include/c++/4.8/bits/stl_map.h:481
    #4 0x1246695 in Ms::Staff::addTimeSig(Ms::TimeSig*) /home/antonio/MuseScore/libmscore/staff.cpp:325
    #5 0x121ff86 in Ms::Segment::add(Ms::Element*) /home/antonio/MuseScore/libmscore/segment.cpp:477
    #6 0x1206b0d in Ms::Score::addElement(Ms::Element*) /home/antonio/MuseScore/libmscore/score.cpp:1318
    #7 0x12fb752 in Ms::AddElement::redo() /home/antonio/MuseScore/libmscore/undo.cpp:1333
    #8 0x12f2bb5 in Ms::UndoStack::push(Ms::UndoCommand*) /home/antonio/MuseScore/libmscore/undo.cpp:248
    #9 0x1212ea8 in Ms::Score::undo(Ms::UndoCommand*) const /home/antonio/MuseScore/libmscore/score.cpp:3291
    #10 0x12f7824 in Ms::Score::undoAddElement(Ms::Element*) /home/antonio/MuseScore/libmscore/undo.cpp:928
    #11 0x11066c4 in Ms::Score::cmdAddTimeSig(Ms::Measure*, int, Ms::TimeSig*, bool) /home/antonio/MuseScore/libmscore/edit.cpp:589
    #12 0x11acf32 in Ms::Measure::drop(Ms::DropData const&) /home/antonio/MuseScore/libmscore/measure.cpp:1444
    #13 0xea1903 in Ms::ScoreView::dropEvent(QDropEvent*) /home/antonio/MuseScore/mscore/dragdrop.cpp:468
    #14 0x7fbd0fdc5081 in ?? ??:0
    #15 0x92c773 in Ms::ScoreView::event(QEvent*) /home/antonio/MuseScore/mscore/scoreview.cpp:3943
    #16 0x7fbd0fd8cf33 in ?? ??:0
    #17 0x7fbd0fd90d91 in ?? ??:0
    #18 0x7fbd11bc6553 in ?? ??:0
    #19 0x7fbd0fde5da5 in ?? ??:0
    #20 0x7fbd0fde699f in ?? ??:0
    #21 0x7fbd0fd8cf33 in ?? ??:0
    #22 0x7fbd0fd9050d in ?? ??:0
    #23 0x7fbd11bc6553 in ?? ??:0
    #24 0x7fbd11399eda in ?? ??:0
    #25 0x7fbd11389b58 in ?? ??:0
    #26 0x7fbd02e72f5d in ?? ??:0
    #27 0x7fbd02e7461f in ?? ??:0
    #28 0x7fbd11395ed9 in ?? ??:0
    #29 0x7fbd11bc6660 in ?? ??:0
    #30 0x7fbd0fd8cea5 in ?? ??:0
    #31 0x7fbd0fd9050d in ?? ??:0
    #32 0x7fbd11bc6553 in ?? ??:0
    #33 0x7fbd113a1980 in ?? ??:0
    #34 0x7fbd113a2204 in ?? ??:0
    #35 0x7fbd11389ae7 in ?? ??:0
    #36 0x7fbd02ec1fcf in ?? ??:0
    #37 0x7fbd0999dd12 in ?? ??:0
    #38 0x7fbd0999e05f in ?? ??:0
    #39 0x7fbd0999e123 in ?? ??:0
    #40 0x7fbd11c16fc3 in ?? ??:0
    #41 0x7fbd11bc52ca in ?? ??:0
    #42 0x7fbd11396171 in ?? ??:0
    #43 0x7fbd113aa911 in ?? ??:0
    #44 0x7fbd113a9ec1 in ?? ??:0
    #45 0xb234fb in Ms::Palette::mouseMoveEvent(QMouseEvent*) /home/antonio/MuseScore/mscore/palette.cpp:435
    #46 0x7fbd0fdc4c4a in ?? ??:0
    #47 0xb2603a in Ms::Palette::event(QEvent*) /home/antonio/MuseScore/mscore/palette.cpp:725
    #48 0x7fbd0fd8cf33 in ?? ??:0
    #49 0x7fbd0fd90335 in ?? ??:0
    #50 0x7fbd11bc6553 in ?? ??:0
    #51 0x7fbd0fd8f389 in ?? ??:0
    #52 0x7fbd0fde46a4 in ?? ??:0
    #53 0x7fbd0fde69e7 in ?? ??:0
    #54 0x7fbd0fd8cf33 in ?? ??:0
    #55 0x7fbd0fd9050d in ?? ??:0
    #56 0x7fbd11bc6553 in ?? ??:0
    #57 0x7fbd113a1980 in ?? ??:0
    #58 0x7fbd113a2204 in ?? ??:0
    #59 0x7fbd11389ae7 in ?? ??:0
    #60 0x7fbd02ec1fcf in ?? ??:0
    #61 0x7fbd0999dd12 in ?? ??:0
    #62 0x7fbd0999e05f in ?? ??:0
    #63 0x7fbd0999e123 in ?? ??:0
    #64 0x7fbd11c16fc3 in ?? ??:0
    #65 0x7fbd11bc52ca in ?? ??:0
    #66 0x7fbd11bc933d in ?? ??:0
    #67 0xaf80c5 in main /home/antonio/MuseScore/mscore/musescore.cpp:4955
    #68 0x7fbd0b36176c in __libc_start_main /build/buildd/eglibc-2.15/csu/libc-start.c:226
    #69 0x8cab28 in _start ??:0
==5369== ABORTING