Program received signal SIGSEGV, Segmentation fault.
0x00007fffd2f9b0a8 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
(gdb) bt
#0  0x00007fffd2f9b0a8 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#1  0x00007fffd2f7e71c in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#2  0x00007fffd2f8fd20 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#3  0x00007ffff6e3ced5 in QStyleFactory::create(QString const&) () from /usr/lib/libQt5Widgets.so.5
#4  0x00007ffff6e62e22 in ?? () from /usr/lib/libQt5Widgets.so.5
#5  0x00007ffff6e64225 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#6  0x00007ffff6dd39ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#7  0x00007ffff6dd8e86 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#8  0x00007ffff5ff5bab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#9  0x00007ffff602bf67 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#10 0x00007ffff602c604 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#11 0x00007fffd2f788d9 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#12 0x00007ffff60241a7 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#13 0x00007ffff6024bbf in QObject::destroyed(QObject*) () from /usr/lib/libQt5Core.so.5
#14 0x00007ffff602c14a in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#15 0x00007fffd2f8fe37 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#16 0x00007ffff5fea235 in ?? () from /usr/lib/libQt5Core.so.5
#17 0x00007ffff5fe2732 in ?? () from /usr/lib/libQt5Core.so.5
#18 0x00007ffff5fe2959 in ?? () from /usr/lib/libQt5Core.so.5
#19 0x00007ffff602c618 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#20 0x00007ffff5fe18c0 in QFactoryLoader::~QFactoryLoader() () from /usr/lib/libQt5Core.so.5
#21 0x00007ffff6e3d439 in ?? () from /usr/lib/libQt5Widgets.so.5
#22 0x00007ffff5468f88 in __run_exit_handlers () from /usr/lib/libc.so.6
#23 0x00007ffff5468fd5 in exit () from /usr/lib/libc.so.6
#24 0x00007ffff40b1b23 in MailCommon::Kernel::emergencyExit(QString const&) () from /usr/lib/libKF5MailCommon.so.5
#25 0x00007ffff40b1f3d in MailCommon::Kernel::createDefaultCollectionDone(KJob*) ()
   from /usr/lib/libKF5MailCommon.so.5
#26 0x00007ffff60241a7 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#27 0x00007ffff6a1ee52 in KJob::result(KJob*, KJob::QPrivateSignal) () from /usr/lib/libKF5CoreAddons.so.5
#28 0x00007ffff6a1fbc1 in KJob::finishJob(bool) () from /usr/lib/libKF5CoreAddons.so.5
#29 0x00007fffefd2ac38 in Akonadi::TransactionSequence::slotResult(KJob*) () from /usr/lib/libKF5AkonadiCore.so.5
#30 0x00007fffefd24863 in Akonadi::SpecialCollectionsRequestJob::slotResult(KJob*) ()
   from /usr/lib/libKF5AkonadiCore.so.5
#31 0x00007fffefd29fe0 in ?? () from /usr/lib/libKF5AkonadiCore.so.5
#32 0x00007ffff602431a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#33 0x00007ffff6a1ee52 in KJob::result(KJob*, KJob::QPrivateSignal) () from /usr/lib/libKF5CoreAddons.so.5
#34 0x00007ffff6a1fbc1 in KJob::finishJob(bool) () from /usr/lib/libKF5CoreAddons.so.5
#35 0x00007fffefd1a0c4 in ?? () from /usr/lib/libKF5AkonadiCore.so.5
#36 0x00007fffefd1e980 in ?? () from /usr/lib/libKF5AkonadiCore.so.5
#37 0x00007ffff602431a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#38 0x00007ffff6a1ee52 in KJob::result(KJob*, KJob::QPrivateSignal) () from /usr/lib/libKF5CoreAddons.so.5
#39 0x00007ffff6a1fbc1 in KJob::finishJob(bool) () from /usr/lib/libKF5CoreAddons.so.5
#40 0x00007fffefd0d40b in ?? () from /usr/lib/libKF5AkonadiCore.so.5
#41 0x00007ffff60251e1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#42 0x00007ffff6dd39ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#43 0x00007ffff6dd8e86 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#44 0x00007ffff5ff5bab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#45 0x00007ffff5ff7fa6 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /usr/lib/libQt5Core.so.5
#46 0x00007ffff604c143 in ?? () from /usr/lib/libQt5Core.so.5
#47 0x00007fffeb94adc7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#48 0x00007fffeb94b020 in ?? () from /usr/lib/libglib-2.0.so.0
#49 0x00007fffeb94b0cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#50 0x00007ffff604c54f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#51 0x00007ffff5ff357a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#52 0x00007ffff5ffb53c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#53 0x0000000000404128 in main ()
(gdb)