QJsonDocument segfault in equality operator

bool QJsonDocument::operator==(const QJsonDocument &other) const
{
    return (!d) ? (!other.d) : (d->value == other.d->value);
}

QJsonDocument validDoc = ... // a valid json document
QJsonDocument invalidDoc{}; // an invalid json document
if (validDoc == invalidDoc) { // segfault here
    ...
}