QObject::dumpObjectInfo might segfault

#include <QObject>
#include <QDebug>

class IntHolder : public QObject {
    Q_OBJECT

private:
    int value_;
public:
    IntHolder() : QObject() {}
    int value() const { return value_; }
    void setValue(int v) { value_ = v; emit valueChanged(value_); }
signals:
    void valueChanged(int);
public slots:
    void changeValue(int v) {
        setValue(v);
    };
};

int main(){
    IntHolder* a = new IntHolder;
    IntHolder* b = new IntHolder;
    QObject::connect(a, SIGNAL(valueChanged(int)), b, SLOT(changeValue(int)));

    a->setValue(3);
    qDebug() << b->value();
    b->dumpObjectInfo();
}

#include "main.moc"