Fatal error: Uncaught exception 'Exception' with message 'Error: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1<br />Error No: 1064<br />SELECT order_id FROM ttl_order_product op WHERE product_id = ' 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('SELECT order_id...', Array) #1 /var/www/thetransportlibrary.co.uk/public_html/catalog/model/catalog/product.php(348): DB->query('SELECT order_id...') #2 [internal function]: ModelCatalogProduct->getProductRelated(NULL) #3 /var/www/thetransportlibrary.co.uk/public_html/vqmod/vqcache/vq2-system_storage_modification_system_engine_loader.php(190): call_user_func_array(Array, Array) #4 [internal function]: Loader->{closure}(Array, Array) #5 /var/www/thetransportlibrary.co.uk/public_html/system/engine/proxy.php(25): call_user_func_array(Object(C in /var/www/thetransportlibrary.co.uk/public_html/system/library/db/mysqli.php on line 40