MySql - problem "Column 2 is not numeric" Opcje

[laresistance]

Mam taki skrypcik w modelu a wywala mi błąd "Column 2 is not numeric".
Ktoś ma pojęcie o co chodzi?

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    function jakasFunkcja()
    {
        $data = array();
        $data[] = array('Rok','Miesiąc','Ilość');
        $query = "SELECT 
                to_char(data_aaa, 'YYYY') AS rok,
                to_char(data_aaa, 'MM') AS miesiac,
         	count(1) as ilosc
        FROM ".$this->APP->config->getVar('db_tables','tabeleczka')."
        WHERE to_char(data_aaa, 'YYYY')='11' AND to_char(data_aaa, 'MM') ='2010'
        GROUP by rok, miesiac
        ORDER BY ilosc DESC";
        //var_dump($query);
        //echo $query;
        $result = $this->APP->db->query($query);
        if (DB::isError($result))
            die($result->getDebugInfo());
 
        while ($row = $result->fetchRow())
        {
            $tmp = array();
            $tmp[] = $row[0];
            $tmp[] = (int)$row[1];
            $tmp[] = (int)$row[2];
 
            $data[] = $tmp;
        }
 
 
        return json_encode($data);
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