Fatal error: Uncaught exception 'Exception' with message 'Error: Unknown column '17_18_23' in 'where clause'<br />Error No: 1054<br /> SELECT c.category_id, cd.category_id, cd.name FROM ttl_category c LEFT JOIN ttl_category_description AS cd ON c.category_id = cd.category_id WHERE c.category_id IN (17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,105,107,149,150,151,152,399,423,269,138,270,271,1,13,14,384,433) AND c.category_id IS NOT NULL AND c.parent_id = 17_18_23 ORDER BY cd.name ASC' in /var/www/thetransportlibrary.co.uk/public_html/system/library/db/mysqli.php:40 Stack trace: #0 /var/www/thetransportlibrary.co.uk/public_html/system/library/db.php(16): DB\MySQLi->query('\n\t\t\tSELECT c.ca...', Array) #1 /var/www/thetransportlibrary.co.uk/public_html/catalog/model/catalog/category.php(74): DB->query('\n\t\t\tSELECT c.ca...') #2 [internal function]: ModelCatalogCategory->getCategoriesByResults('17_18_23', Object(stdClass)) #3 /var/www/thetransportlibrar in /var/www/thetransportlibrary.co.uk/public_html/system/library/db/mysqli.php on line 40