A Database Error Occurred

Error Number: 1064

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 '`NULL` AND `rgt` > `IS` `NULL` ORDER BY `lft` ASC, `order` ASC' at line 5

SELECT `id`, `title`, `slug`, `canonical`, `lft`, `rgt` FROM `articles_catalogues` WHERE `trash` =0 AND `language` = 'vie' AND `lft` < `IS` `NULL` AND `rgt` > `IS` `NULL` ORDER BY `lft` ASC, `order` ASC

Filename: modules/articles/models/Frontendarticlescatalogues_model.php

Line Number: 86