[self Solved]model segmentation fault

[pmjz]

I have generated a list that holds 1000 list for user info, every time I just get 40 users and display in the QTableView. that means, 0-39, when users scroll to 40, the application will get other 40 users and display. so,my solution works very well when I scroll down, for example 0-39 and then 40 - 79. but if I wanna go back, 40 -> 39, as soon as I click the vertical bar, the application inform me "model->insertRow(row,iterator.next)" segmentation fault. welcome any ideas.

@
void TestHugeDataDialog::updateTableModel(const QList< QList<QStandardItem*> > &list,int value)
{
QStandardItemModel *model;
bool setModelFlag = false;
if(!ui->tableView->model()){
model = new QStandardItemModel(this);
setModelFlag = true;
}else{
model = qobject_cast<QStandardItemModel >(ui->tableView->model());
}
model->clear();
QListIterator< QList<QStandardItem> > iterator(list);
int row = 0;

while(iterator.hasNext())
{
    model->insertRow(row,iterator.next());
    row++;
}


model->setHeaderData(0,Qt::Horizontal,tr("Name"));
model->setHeaderData(1,Qt::Horizontal,tr("Address"));
if(setModelFlag){
    ui->tableView->setModel(model);
}

}

@

[pmjz]

this sinppet is not wrong, I just delete data that has been new. big lesson