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-roquetas-de-mar-alternative-zu-sonne-und-strand)' at line 3
SELECT new
FROM news_news_categories
WHERE cat IN (4,13,19,20,21,birdwatching-in-roquetas-de-mar-alternative-zu-sonne-und-strand)