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 'is-het-autorijden-met-slippers-nu-wel-of-niet-strafbaar-in-spanje)' at line 3
SELECT new
FROM news_news_categories
WHERE cat IN (4,13,19,20,21,is-het-autorijden-met-slippers-nu-wel-of-niet-strafbaar-in-spanje)