Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f38c40d6881 in QSqlDatabase::close() () from /usr/lib/libQt5Sql.so.5
(gdb) bt
#0  0x00007f38c40d6881 in QSqlDatabase::close() () from /usr/lib/libQt5Sql.so.5
#1  0x00007f38c40d7de9 in QSqlDatabase::~QSqlDatabase() () from /usr/lib/libQt5Sql.so.5
#2  0x00007f38c40d9e1d in ?? () from /usr/lib/libQt5Sql.so.5
#3  0x00007f38dea64289 in QHashData::free_helper(void (*)(QHashData::Node*)) () from /usr/lib/libQt5Core.so.5
#4  0x00007f38c40d6553 in ?? () from /usr/lib/libQt5Sql.so.5
#5  0x00007f38de257e78 in __run_exit_handlers () from /usr/lib/libc.so.6
#6  0x00007f38de257ec5 in exit () from /usr/lib/libc.so.6
#7  0x00007f38d41ba34e in QXcbConnection::processXcbEvents() () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007f38dec10eb1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#9  0x00007f38debe1769 in QCoreApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#10 0x00007f38debe189b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#11 0x00007f38debe3c96 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#12 0x00007f38dec37e33 in ?? () from /usr/lib/libQt5Core.so.5
#13 0x00007f38daa0f9fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#14 0x00007f38daa0fce0 in ?? () from /usr/lib/libglib-2.0.so.0
#15 0x00007f38daa0fd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#16 0x00007f38dec3823f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#17 0x00007f38debdf26a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#18 0x00007f38debe720c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#19 0x0000000000412574 in main ()