Dupilcate database prefix on like

[eluser]Bnoe[/eluser]

Code:

$this->db->like('users.username', $key);
            $this->db->or_like('user_profile.keterangan', $key);
            $this->db->join('user_profile','tbl_users.user_id=tbl_user_profile.user_id','left');
            $query = $this->db->get('users');

got this query

SELECT * FROM (`tbl_users`) LEFT JOIN `tbl_user_profile` ON tbl_users.user_id=tbl_user_profile.user_id WHERE tbl_tbl_users.username LIKE '%a%' OR tbl_tbl_user_profile.description LIKE '%a%' LIMIT 20