WordPress database error: [Unknown column 'slug' in 'where clause']
SELECT DISTINCT wp_ngg_pictures.* , GROUP_CONCAT(CONCAT_WS('@@', meta_key, meta_value)) AS 'extras' FROM `wp_ngg_pictures` LEFT OUTER JOIN `wp_postmeta` ON `wp_postmeta`.`post_id` = `extras_post_id` WHERE (slug = '') AND (`exclude` != 1) GROUP BY wp_ngg_pictures.pid ORDER BY `sortorder` ASC