A Database Error Occurred

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') AND a.themes_id <> '3788' ORDER BY a.themes_id DESC LIMIT 4' at line 3

SELECT a.themes_id FROM themes_categories as a INNER JOIN themes as b ON a.themes_id = b.id WHERE a.categories_id IN () AND a.themes_id <> '3788' ORDER BY a.themes_id DESC LIMIT 4