Database Error

Query: "SELECT p.id as id, pe.seflink as yazarseflink, pe.title 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 = p.id JOIN author_book as ab ON ab.book_id = p.id JOIN people as pe ON pe.id = ab.author_id WHERE p.deleted = '0' AND p.status = '0' AND (FROM_BASE64(p.detail1) LIKE '%nikolay-ostrovski%' OR p.title LIKE '%nikolay-ostrovski%' OR p.description LIKE '%nikolay-ostrovski%' OR p.stockcode LIKE '%nikolay-ostrovski%' OR pe.title LIKE '%nikolay-ostrovski%' OR pe.seflink LIKE '%nikolay-ostrovski%' OR p.seflink LIKE '%nikolay-ostrovski%') GROUP BY p.id ORDER BY p.creation DESC"

Error: FUNCTION dorliony_portal.FROM_BASE64 does not exist