Database Error

Query: "SELECT as id, pe.seflink as yazarseflink, as yazar, p.title, p.tablealias, p.seflink, p.creation, p.detail1, p.description FROM product as p JOIN product_category_items as pci ON pci.p_id = JOIN users as pe ON = p.people WHERE p.deleted = '0' AND p.status = '0' AND ( LIKE '%Bet��l Do��an Akka��%' OR pe.seflink LIKE '%Bet��l Do��an Akka��%') GROUP BY ORDER BY p.creation DESC"

Error: '' isn't in GROUP BY