QAuthenticator operator== crashes

 QAuthenticator s1, s2;
 s1.setUser("User");
 if (s2 == s1) {}

bool QAuthenticator::operator==(const QAuthenticator &other) const
{
    if (d == other.d)
        return true;
    return d->user == other.d->user
        && d->password == other.d->password
        && d->realm == other.d->realm
        && d->method == other.d->method
        && d->options == other.d->options;
}