Problem with QGraphicsTextItem

[johnkrusty]

I have a class

class Letter : public QGraphicsTextItem
{
public:
    Letter();
    ~Letter();
    void setText(const QString &text);
    QString getText();
protected:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
    QRectF boundingRect() const;
    QPainterPath shape() const;
 
private:
    QString myText;
    QTextOption myTextOption;
};

class Letter : public QGraphicsTextItem
{
public:
    Letter();
    ~Letter();
    void setText(const QString &text);
    QString getText();
protected:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
    QRectF boundingRect() const;
    QPainterPath shape() const;

private:
    QString myText;
    QTextOption myTextOption;
};

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Letter::Letter()
{
    myTextOption.setAlignment(Qt::AlignCenter);
    myTextOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
}
 
Letter::~Letter() {
 
}
 
QRectF Letter::boundingRect() const {
    return QRectF(0,0,145,145);
}
 
QPainterPath Letter::shape() const {
    QPainterPath path;
    path.addRect(boundingRect());
    return path;
}
 
void Letter::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
    painter->fillRect(boundingRect(),Qt::red);
    painter->setPen(Qt::white);
    painter->setFont(QFont("Open Sans", 60));
    painter->drawText(boundingRect(),myText,myTextOption);
    QGraphicsTextItem::paint(painter,option,widget);
}
 
void Letter::setText(const QString &text) {
    myText = text;
    this->update();
}
 
QString Letter::getText() {
    return myText;
}

Letter::Letter()
{
    myTextOption.setAlignment(Qt::AlignCenter);
    myTextOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
}

Letter::~Letter() {

}

QRectF Letter::boundingRect() const {
    return QRectF(0,0,145,145);
}

QPainterPath Letter::shape() const {
    QPainterPath path;
    path.addRect(boundingRect());
    return path;
}

void Letter::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
    painter->fillRect(boundingRect(),Qt::red);
    painter->setPen(Qt::white);
    painter->setFont(QFont("Open Sans", 60));
    painter->drawText(boundingRect(),myText,myTextOption);
    QGraphicsTextItem::paint(painter,option,widget);
}

void Letter::setText(const QString &text) {
    myText = text;
    this->update();
}

QString Letter::getText() {
    return myText;
}

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I add letters to QGraphicsScene

class GameField : public QGraphicsScene
{
public:
    GameField();
};
 
GameField::GameField()
{
    this->setBackgroundBrush(QBrush(QColor(230,230,230),Qt::SolidPattern));
    for (int i = 10; i < 610; i += 150) {
        for (int j = 10; j < 610; j += 150) {
            Letter *letter = new Letter();
            letter->setText(QString('A'+qrand()%26));
            this->addItem(letter);
            letter->setPos(i, j);
        }
    }
}

class GameField : public QGraphicsScene
{
public:
    GameField();
};

GameField::GameField()
{
    this->setBackgroundBrush(QBrush(QColor(230,230,230),Qt::SolidPattern));
    for (int i = 10; i < 610; i += 150) {
        for (int j = 10; j < 610; j += 150) {
            Letter *letter = new Letter();
            letter->setText(QString('A'+qrand()%26));
            this->addItem(letter);
            letter->setPos(i, j);
        }
    }
}

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but when I try to click on any letter, my program crashes.