Out of bounds Qlist

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Hello! a new noob is here ^^

I`m getting the following error as I use clear() in a QListWidget from my ui:

ASSERT failure in QList<T>::operator[]: "index out of range", file ../../QT/2010.05/qt/include/QtCore/../../src/corelib/tools/qlist.h, line 463

ASSERT failure in QList<T>::operator[]: "index out of range", file ../../QT/2010.05/qt/include/QtCore/../../src/corelib/tools/qlist.h, line 463

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the QListWidget is adding itens correctly, but it crashes as I try to remove them.
I tried using takeItem inside a for but the same error ocurred
Please help.

void MyDialog::on_remove_my_bt_clicked()
{
    int currentIdx = ui->my_list->currentIndex().row();
    if(currentIdx>-1){
        listA.removeAt(currentIdx);
        if(listA.size()>0){
            updateMyList();
        }else{
            ui->my_list->clear();//<- error here
            listReady = false;
        }
    }
}
 
void MyDialog::updateMyList()
{
    ui->my_list->clear();//<- error here
    ...
}

void MyDialog::on_remove_my_bt_clicked()
{
    int currentIdx = ui->my_list->currentIndex().row();
    if(currentIdx>-1){
        listA.removeAt(currentIdx);
        if(listA.size()>0){
            updateMyList();
        }else{
            ui->my_list->clear();//<- error here
            listReady = false;
        }
    }
}

void MyDialog::updateMyList()
{
    ui->my_list->clear();//<- error here
    ...
}

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