Qt 5.15 crash

0x00007ffff5b392b8 in list_append(QQmlListProperty<QObject>*, QObject*) () from /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
(gdb) bt
#0  0x00007ffff5b392b8 in list_append(QQmlListProperty<QObject>*, QObject*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#1  0x00007ffff5bc9ea7 in QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#2  0x00007ffff5bca513 in QQmlObjectCreator::setupBindings(bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#3  0x00007ffff5bc6b93 in QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#4  0x00007ffff5bc7ebe in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#5  0x00007ffff5bcaf1e in QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#6  0x00007ffff5bc8321 in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#7  0x00007ffff5bc9fd7 in QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#8  0x00007ffff5bca513 in QQmlObjectCreator::setupBindings(bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#9  0x00007ffff5bc6b93 in QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#10 0x00007ffff5bc7ebe in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#11 0x00007ffff5bc9fd7 in QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#12 0x00007ffff5bca513 in QQmlObjectCreator::setupBindings(bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#13 0x00007ffff5bc6b93 in QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#14 0x00007ffff5bc7ebe in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#15 0x00007ffff5bc9fd7 in QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#16 0x00007ffff5bca513 in QQmlObjectCreator::setupBindings(bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#17 0x00007ffff5bc6b93 in QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#18 0x00007ffff5bc7ebe in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#19 0x00007ffff5bcaf1e in QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#20 0x00007ffff5bc8321 in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#21 0x00007ffff5bc9fd7 in QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#22 0x00007ffff5bca513 in QQmlObjectCreator::setupBindings(bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#23 0x00007ffff5bc6b93 in QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#24 0x00007ffff5bc7ebe in QQmlObjectCreator::createInstance(int, QObject*, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#25 0x00007ffff5bcaf1e in QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#26 0x00007ffff5b51848 in QQmlComponentPrivate::beginCreate(QQmlContextData*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#27 0x00007ffff5b4f5e5 in QQmlComponentPrivate::doBeginCreate(QQmlComponent*, QQmlContext*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#28 0x00007ffff5b52e8f in QQmlComponent::createWithInitialProperties(QMap<QString, QVariant> const&, QQmlContext*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#29 0x00007ffff5bba133 in QQmlApplicationEnginePrivate::finishLoad(QQmlComponent*) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#30 0x00007ffff5bba3ce in QQmlApplicationEnginePrivate::startLoad(QUrl const&, QByteArray const&, bool) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#31 0x00007ffff5bba3fd in QQmlApplicationEngine::load(QUrl const&) () at /home/jbb/.local/Qt/5.15.0/gcc_64/lib/libQt5Qml.so.5
#32 0x0000555555574498 in DiscoverObject::DiscoverObject(DiscoverObject::CompactMode, QMap<QString, QVariant> const&) (this=0x5555556970c0, mode=<optimized out>, initialProperties=...)
    at /home/jbb/kde/src/discover/discover/DiscoverObject.cpp:149
#33 0x0000555555569c36 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/include/c++/9/bits/move.h:74