ASAN:SIGSEGV
=================================================================
==6156==ERROR: AddressSanitizer: SEGV on unknown address 0x7f7f57f62d30 (pc 0x7f7f6fee268a sp 0x7fff0f7fef08 bp 0x6040002a7cd0 T0)
    #0 0x7f7f6fee2689 in QSqlDatabase::close() (/home/antonio/Qt5.4.0/5.4/gcc_64/lib/libQt5Sql.so.5+0x14689)
    #1 0x7f7f6fee26bc in QSqlDatabase::~QSqlDatabase() (/home/antonio/Qt5.4.0/5.4/gcc_64/lib/libQt5Sql.so.5+0x146bc)
    #2 0x7f7f6fee4cdc (/home/antonio/Qt5.4.0/5.4/gcc_64/lib/libQt5Sql.so.5+0x16cdc)
    #3 0x7f7f7ba687b9 in QHashData::free_helper(void (*)(QHashData::Node*)) (/home/antonio/Qt5.4.0/5.4/gcc_64/lib/libQt5Core.so.5+0x1027b9)
    #4 0x7f7f6fee193e (/home/antonio/Qt5.4.0/5.4/gcc_64/lib/libQt5Sql.so.5+0x1393e)
    #5 0x7f7f7413d258 (/lib/x86_64-linux-gnu/libc.so.6+0x3c258)
    #6 0x7f7f7413d2a4 in exit (/lib/x86_64-linux-gnu/libc.so.6+0x3c2a4)
    #7 0xc51baf in main /home/antonio/MuseScore/mscore/musescore.cpp:4959
    #8 0x7f7f74122ec4 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)
    #9 0x9bf8c8 (/usr/local/bin/mscore+0x9bf8c8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV ??:0 QSqlDatabase::close()
==6156==ABORTING