Error: Expression #5 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'autolubr_site.ui.filename' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
Trace on: /var/www/vhosts/autolubricants.ro/httpdocs/include/class/db.class.php(339)

SQL: SELECT
`produse`.`id`, `produse`.`nume`, `produse`.`pret`, `produse`.`pret_nou`,
IF(
ISNULL(ui.parent_id),
'template/images/default.jpg',
CONCAT('userfiles/', ui.category, '/', ui.parent_id, '/', ui.filename)
) AS pic
FROM `produse`
LEFT JOIN `sys_upload_images` ui ON(ui.parent_id=produse.id AND ui.category='produse')
WHERE visible=1 AND categorie IN(12, 17, 18)
GROUP BY produse.id
ORDER BY `produse`.`order` ASC LIMIT 0, 9