Nullptr dereference in qcoretextfontdatabase.mm

QCoreTextFontDatabase::populateThemeFonts() {
    ...
    auto addFontVariants = [&](CTFontDescriptorRef descriptor) {
        QCFType<CFArrayRef> matchingDescriptors = CTFontDescriptorCreateMatchingFontDescriptors(descriptor, nullptr);
        const int matchingDescriptorsCount = CFArrayGetCount(matchingDescriptors); <--- matchingDescriptors can be nil
    ...
}