QNetworkAccessManager constructor crash

[EpicLoyd]

^ crashes at class constuctor. Class

class Updater: public QObject{
private:
QNetworkAccessManager *mgr;
public:
Updater(){ mgr = new QNetworkAccessManager(); // crashes here
};
~Updater();
void CheckFiles();
}

i'm running class like that:

    QFuture<void> ft = QtConcurrent::run([&]{
                                                 Updater *upd = new Updater();
                                             }
                                         );

Why?And how can i fix that?

[jsulm]

Works here.
What is the error message you get if it crashes?
Does it crash if you comment out mgr = new QNetworkAccessManager();?

[EpicLoyd]

@jsulm no, it wouldn't crash o.o