QSqlQuery problem (insert once but create two rows!!!)

[ditsikts]

When I insert a name, create two rows

Here is insert statement

void wmtDB::addEmployee(QString name)
{
    QSqlQuery qry;
    qry.prepare("INSERT INTO employeestuff (name) VALUES (:name)");
    qry.bindValue(":name", name );
    if (!qry.exec())
        qFatal("Failed to add employee");
}

void wmtDB::addEmployee(QString name)
{
    QSqlQuery qry;
    qry.prepare("INSERT INTO employeestuff (name) VALUES (:name)");
    qry.bindValue(":name", name );
    if (!qry.exec())
        qFatal("Failed to add employee");
}

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and here the call

void MainWindow::buttonOnClick()
{
    employees.addEmployee(ui->lineEdit->text());
    updateEmployees();
}

void MainWindow::buttonOnClick()
{
    employees.addEmployee(ui->lineEdit->text());
    updateEmployees();
}

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if db is empty and i run it one time with parameter "john"
the "SELECT * FROM nameTable"
will return
1 "john"
2 "john"

please help me