Setting httpUserAgent crashes

Invalid read of size 8
  in main in /home/jopoikel/work/tests/untitled2/main.cpp:11
Address 0x10 is not stack'd, malloc'd or (recently) free'd  1: QQuickWebEngineProfile::setHttpUserAgent(QString const&) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5WebEngine.so.5.14.1
  2: QWebEngineWebViewPrivate::setHttpUserAgent(QString const&) in /home/jopoikel/Qt/5.14.1/gcc_64/plugins/webview/libqtwebview_webengine.so
  3: QQuickWebView::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5WebView.so.5.14.1
  4: QQmlPropertyData::writeProperty(QObject*, void*, QFlags<QQmlPropertyData::WriteFlag>) const in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  5: QQmlObjectCreator::setPropertyValue(QQmlPropertyData const*, QV4::CompiledData::Binding const*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  6: QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  7: QQmlObjectCreator::setupBindings(bool) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  8: QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  9: QQmlObjectCreator::createInstance(int, QObject*, bool) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  10: QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  11: QQmlObjectCreator::setupBindings(bool) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  12: QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  13: QQmlObjectCreator::createInstance(int, QObject*, bool) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  14: QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  15: QQmlComponentPrivate::beginCreate(QQmlContextData*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  16: QQmlComponentPrivate::doBeginCreate(QQmlComponent*, QQmlContext*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  17: QQmlComponent::create(QQmlContext*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  18: QQmlApplicationEnginePrivate::finishLoad(QQmlComponent*) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  19: QQmlApplicationEnginePrivate::startLoad(QUrl const&, QByteArray const&, bool) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  20: QQmlApplicationEngine::load(QUrl const&) in /home/jopoikel/Qt/5.14.1/gcc_64/lib/libQt5Qml.so.5.14.1
  21: main in /home/jopoikel/work/tests/untitled2/main.cpp:11