QTableWidget crashes on setItem

[Raccoon29]

I everyone,

I'm trying to fill a QTableWidget with some items, but when trying setItem it segmentation faults.

// vLastId is a ID int
    // n becomes 2
    // query is valid
    int n=viewport->db->Count("customer_addresses a,contacts c",
        "c.id_customer=a.id_customer AND c.id="+QString::number(vLastId));
    QSqlQuery query=viewport->db->Select("a.id,a.ragsoc","customer_addresses a,contacts c",
        "c.id_customer=a.id_customer AND c.id="+QString::number(vLastId));
 
    // two columns defined elsewhere
    ui.tbwcaddresses->setSortingEnabled(false);
    ui.tbwcaddresses->setRowCount(n);
    int row=0;
    while(query.next())
    {
        CTableWidgetItem *zid=new CTableWidgetItem(query.value(0).toString());
        ui.tbwcaddresses->setItem(row,0,zid); // this row fails and throws exception
 
        CTableWidgetItem *iragsoc=new CTableWidgetItem(query.value(1).toString());
        ui.tbwcaddresses->setItem(row,1,iragsoc); // this doesn't fail, and seems the same operation!
        ...
        row++;
    }
    ui.tbwcaddresses->setSortingEnabled(true);

// vLastId is a ID int
    // n becomes 2
    // query is valid
    int n=viewport->db->Count("customer_addresses a,contacts c",
        "c.id_customer=a.id_customer AND c.id="+QString::number(vLastId));
    QSqlQuery query=viewport->db->Select("a.id,a.ragsoc","customer_addresses a,contacts c",
        "c.id_customer=a.id_customer AND c.id="+QString::number(vLastId));

    // two columns defined elsewhere
    ui.tbwcaddresses->setSortingEnabled(false);
    ui.tbwcaddresses->setRowCount(n);
    int row=0;
    while(query.next())
    {
        CTableWidgetItem *zid=new CTableWidgetItem(query.value(0).toString());
        ui.tbwcaddresses->setItem(row,0,zid); // this row fails and throws exception

        CTableWidgetItem *iragsoc=new CTableWidgetItem(query.value(1).toString());
        ui.tbwcaddresses->setItem(row,1,iragsoc); // this doesn't fail, and seems the same operation!
        ...
        row++;
    }
    ui.tbwcaddresses->setSortingEnabled(true);

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If I bypass the excepting row, the second setitem works well.
I've done this operation tons of times before, but never this problem... What could it be?

Thank you in advance