MySQL returned error

Error Description :
Error No : 1064
Description : 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 'and slug='4-x-4-round-cover'' at line 1

SQL Query
SELECT `category`.* FROM `category` WHERE id!=0 AND status='Active' and parentcategory_id= and slug='4-x-4-round-cover'