Stumbled upon this after deleting .qmlc file after it got pulled into repository accidentally

When I launched a debug build from qt creator I was greeted by this assert

this happens on

quickView = new QQuickWidget;
quickView->rootContext()->setContextProperty("infoObject", &report);
auto url = QUrl::fromLocalFile("QML/detailed.qml");
bool validUrl = url.isValid();
// url is valid, I made sure of that, crash happens on the line below
quickView->setSource(url);

Launching in release build regenerates the "detailed.qmlc" and after that debug build also works alright. The moment I manually delete qmlc again the crash starts happening again.