Casting of a QGraphicsItem subclass

Hello,
i'm new in QT and i'm having problems with QGraphicsItem and my suclassed "Item".
I have a QGraphicsView that contains a QGraphicsScene in which i'm inserting some items.
Those items are a subclass of QGraphicsItem and i have called it TestHoverItem (It contains some additional values).

If i try to get one of the object i have in the QGraphicsScene using the itemAt() function i have no problem (code below)

Code:

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QGraphicsItem::mousePressEvent(e);
    QPoint point = e->scenePos().toPoint();
 
    auto sceneTop = scene();
 
    QGraphicsItem *item = sceneTop->itemAt(point.x(), point.y(),QTransform());
    TestHoverItem *hover = qgraphicsitem_cast<TestHoverItem *>(item);
    qDebug() << "Codice " << QString::number(hover->getCodice());

---

If i try to get all the objects from the QGraphicsScene using the items() function the application crashes

Code:

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QList<QGraphicsItem *> items;
    items = sceneTop->items();
    qDebug() << "Numero items " + QString::number(items.size());
   //Fin qui tutto bene
    TestHoverItem * aa= new TestHoverItem();
    for(int i=0; i<items.size(); i++){
        aa =qgraphicsitem_cast<TestHoverItem *>(items[i]);
        qDebug() << "Codice: " +QString::number(aa->getCodice());
    }

---

Can someone explain me what i'm doing wrong?
Thank you for the time and , i hope , for the answers

Quote:

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TestHoverItem * aa= new TestHoverItem();

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Why do you do this? You need a variable to hold a pointer to a TestHoverItem, not a new item.

Quote:

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aa =qgraphicsitem_cast<TestHoverItem *>(items[i]);

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If the item is -not- a TestHoverItem, then the cast returns a NULL pointer. You then proceed to use that pointer (without checking to see if it -is- NULL) in the qDebug() statement that follows.