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 'in-de-regio-valencia)' at line 3
SELECT new
FROM news_news_categories
WHERE cat IN (4,13,19,20,21,de-goedkoopste-en-duurste-plaatsen-voor-woningaankoop-in-de-regio-valencia)