<br />
<b>Fatal error</b>:  Uncaught exception 'Exception' with message 'Error: Unknown column '51_52_54' in 'where clause'&lt;br /&gt;Error No: 1054&lt;br /&gt;
			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 (51,52,53,54,55,56,59,61,62,63,72,73,74,75,340,345,366,367,368,369,376,379,380,381,382,385,395,397,404,430,477)
				AND
				c.category_id IS NOT NULL AND c.parent_id = 51_52_54 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-&gt;query('\n\t\t\tSELECT c.ca...', Array)
#1 /var/www/thetransportlibrary.co.uk/public_html/catalog/model/catalog/category.php(74): DB-&gt;query('\n\t\t\tSELECT c.ca...')
#2 [internal function]: ModelCatalogCategory-&gt;getCategoriesByResults('51_52_54', Object(stdClass))
#3 /var/www/thetransportlibrary.co.uk/public_html/vqmod/vqcache/v in <b>/var/www/thetransportlibrary.co.uk/public_html/system/library/db/mysqli.php</b> on line <b>40</b><br />