Active record Update issue

[eluser]chinedubond[/eluser]
please i keep getting an error with my code below.
i am trying to update a table.
i believe i am doing everything ok.

please help.

Code:

$array = array('timeregistered' => $timereg, 'password' => $password);
        $this->db->set('active', 1);
        $this->db->where($array);
        $query=$this->db->update('ng_contactperson');  

[b]LINE 34[/b]    if($query->num_rows() > 0){
        
        return true;
        
        }
        else{
        
        return FALSE;
        }

Code:

Fatal error: Call to a member function num_rows() on a non-object in D:\dumps\opensource\projects\nightengale\bizlocator\system\application\models\users\usersmodel.php on line 34