Missing Exception in qmutablelinkedlistiterator

 QLinkedList<qreal> data2 = QLinkedList<qreal>();

 data2.append(2.0);
 data2.append(1.5);
 data2.append(1.0);
 data2.append(0.5);
 QMutableLinkedListIterator<qreal> itterator(data2);
 itterator.toFront();
 qDebug() << "Debug";
 //qDebug() << itterator.value();  //<- Throws Assert Error
 qDebug() << itterator.next();