QGraphicsScene selectedItems bounding rect returns -nan

[devdon]

QList<QGraphicsItem*> iList;
 
    iList = scene->selectedItems();
    QRectF bRect = scene->selectionArea().boundingRect();

QList<QGraphicsItem*> iList;

    iList = scene->selectedItems();
    QRectF bRect = scene->selectionArea().boundingRect();

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Hello: The above code returns
h (qreal)
w (qreal)
x -nan(0xffffe1518ee2)
y (qreal)

Since I am new to QT perhaps this is to be expected, but the selectedItems() function seems a bit sketchy. I have an important routine that relies on it and it doesn't seem to return all the items consistently. Has anyone an explanation or similar experiences?