QFile::readLine() cause segfault if QFile was not previously opened

#include <QFile>

#include <QtDebug>

int main(int argc, char* argv[])
{
    QString file_name;

    QFile iut(file_name, new QObject());

    for (int i = 0; i < 10; ++i)
        qDebug() << iut.readLine();
}