Segmentation fault while trying to get a QVariant from a QJsonValue containing an empty QJsonObject or QJsonArray

While coding a personal program, I saw some unexpected segmentation faults when I use the "QVariant QJsonValue::toVariant();" method on a QJsonValue containing an empty QJsonArray:

QJsonArray a; // a = []
QJsonValue v(a); // QJsonValue with the empty QJsonArray
QVariant vari = v.toVariant(); // Segmentation fault (SIGSEGV)

While trying to reproduce the bug in my personal program, I also noticed that the same SIGSEGV happened with an empty QJsonObject:

QJsonObject o; // o = {}
QJsonValue v(o); // QJsonValue with the empty QJsonObject
QVariant vari = v.toVariant(); // Segmentation fault (SIGSEGV)

I do not thing that I missed something dealing with that in the Qt Documentation. Moreover, I do not remember getting such a bug with Qt 5.0.