Kaidan camera bt

Thread 1 "qrskanner" received signal SIGSEGV, Segmentation fault.
0x0000000000000020 in ?? ()
(gdb) bt
#0  0x0000000000000020 in ?? ()
#1  0x00007ffff6bf822b in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Qml.so.5
#2  0x00007ffff5050252 in QMetaObject::activate(QObject*, int, int, void**) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#3  0x0000555555563393 in QrCodeScanner::scanningFailed() ()
#4  0x000055555555dd1f in QrCodeScanner::processImage(QImage const&)::{lambda()#2}::operator()() const ()
#5  0x000055555555f078 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, QrCodeScanner::processImage(QImage const&)::{lambda()#2}>::call({lambda()#2}&, void**) ()
#6  0x000055555555ee89 in void QtPrivate::Functor<QrCodeScanner::processImage(QImage const&)::{lambda()#2}, 0>::call<QtPrivate::List<>, void>({lambda()#2}&, void*, {lambda()#2}&*) ()
#7  0x000055555555ec8d in QtPrivate::QFunctorSlotObject<QrCodeScanner::processImage(QImage const&)::{lambda()#2}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) ()
#8  0x00007ffff505c776 in QSingleShotTimer::timerEvent(QTimerEvent*) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#9  0x00007ffff5050b1b in QObject::event(QEvent*) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#10 0x00007ffff62a9e9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Widgets.so.5
#11 0x00007ffff62b0fa0 in QApplication::notify(QObject*, QEvent*) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Widgets.so.5
#12 0x00007ffff5022ea8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#13 0x00007ffff507a649 in QTimerInfoList::activateTimers() () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#14 0x00007ffff507ae21 in timerSourceDispatch(_GSource*, int (*)(void*), void*) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#15 0x00007ffff44b9f2e in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff44ba1c8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff44ba25c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff507b18f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#19 0x00007ffff5021902 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#20 0x00007ffff502a260 in QCoreApplication::exec() () from /home/jbb/.local/Qt/5.13.0/gcc_64/lib/libQt5Core.so.5
#21 0x000055555555ca75 in main ()