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Source code

    QString text = model->data(index, Qt::DisplayRole).toString();
    
    QTextDocument textDocument;
    textDocument.setHtml(text);

    QTextLayout textLayout(textDocument.begin());
    textLayout.setFont(opt.font);

    textLayout.beginLayout();
    qreal height = 0;
    while (1) {
        QTextLine line = textLayout.createLine(); // CRASHES HERE
        if (!line.isValid())
            break;

        line.setLineWidth(100); // just dummy estimate
        height += 5; // just dummy estimate
        line.setPosition(QPoint(0, height));
        height += line.height();
    }
    textLayout.endLayout();

    ....
    textLayout.draw(painter, QPointF(textRect.left(), textRect.top()));

Source code

#include <QApplication>
#include <QtGui>

class RichDelegate : public QItemDelegate
{
public:
  void paint ( QPainter * painter,
               const QStyleOptionViewItem & option,
               const QModelIndex & index           ) const;
};

void RichDelegate::paint(
  QPainter * painter,
  const QStyleOptionViewItem & option,
  const QModelIndex & index           ) const
{
    // stripped down to the minimum sufficient to reproduce the crash
    QString text = "<b>Test</b> text";
    QTextDocument textDocument;
    textDocument.setHtml(text);
    QTextLayout textLayout(textDocument.begin());
    textLayout.beginLayout();
    //QTextLine line = textLayout.createLine(); // UNCOMMENT THIS TO CRASH
    textLayout.endLayout();
}

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  QTableView mainWindow;

  QStringList cells = QStringList() << "<b>Dummy field</b>";
  QStringListModel model(cells, &mainWindow);
  mainWindow.setModel(&model);
  RichDelegate richDelegate;
  mainWindow.setItemDelegate(&richDelegate);
  mainWindow.show();  
  return app.exec ();
}