#include <QApplication>
#include <QTreeView>
#include <QTimer>

class tree_model : public QAbstractItemModel
{
  bool crash = false;
public:
  tree_model () {}
  ~tree_model () {}

  void set_crash ()
  {
    crash = true;
  }

  virtual QModelIndex index (int row, int column, const QModelIndex& parent = QModelIndex()) const override
  {
    if (parent.isValid ())
      return {};

    return createIndex (row, column, nullptr);
  }


  virtual QModelIndex parent (const QModelIndex& child) const override
  {
    return {};
  }


  virtual int rowCount (const QModelIndex& parent = QModelIndex()) const override
  {
    if (parent.isValid ())
      return 0;

    return 10;
  }


  virtual int columnCount (const QModelIndex& parent = QModelIndex()) const override
  {
    return 1;
  }


  virtual QVariant data (const QModelIndex& index, int role = Qt::DisplayRole) const override
  {
    if (crash)
      *(int *)0 = 0;

    if (role == Qt::DisplayRole)
      return index.row ();

    return {};
  }

};


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

    tree_model model; 

    QTreeView view;
    view.setModel(&model);
    view.show();
    QTimer::singleShot (1000, [&] { model.set_crash (); view.setModel (nullptr); });

    return app.exec();
}