QListWidget crash when reusing the widget associated with item

[developer-123 0]

I have a custom simple widget inheriting from QWidget and I add it to a QListWidget like this :

void MainWindow::AddToWidgetList(const QString &tag, const QString &html)
{
    HtmlItem *html_item = new HtmlItem();
    html_item->set_tag(tag);
    html_item->set_html(html);
    connect(html_item, SIGNAL(RemoveIt(uintptr_t)), this, SLOT(on_RmBtn_clicked(uintptr_t)));
    QListWidgetItem *list_item = new QListWidgetItem();
    html_item->set_list_item(list_item);
    list_item->setSizeHint(html_item->sizeHint());
    ui->CodeBlocks->addItem(list_item);
    ui->CodeBlocks->setItemWidget(list_item, html_item);
}

I then want to move the selected element up when a button is pressed

void MainWindow::on_UpArrowBtn_clicked()
{
    if (ui->CodeBlocks->count() < 2)
        return;
    int current_row = ui->CodeBlocks->currentRow();
    if (current_row == 0)
        return;
    HtmlItem *item_widget = (HtmlItem*)ui->CodeBlocks->itemWidget(ui->CodeBlocks->item(current_row));
    QListWidgetItem *item = ui->CodeBlocks->takeItem(current_row);
    ui->CodeBlocks->insertItem(current_row - 1, item);
    ui->CodeBlocks->setItemWidget(item, item_widget);
}

but I get crash in this line :

ui->CodeBlocks->setItemWidget(item, item_widget);

[jsulm]

@developer-123-0 said in QListWidget crash when reusing the widget associated with item:

but I get crash in this line

what kind of crash is that? Did you already debug to see what happens?
Is item_widget a valid pointer?
After this line you do not check the pointer:

HtmlItem *item_widget = (HtmlItem*)ui->CodeBlocks->itemWidget(ui->CodeBlocks->item(current_row));