1064 - SQL syntax error, v4.0.1

i have installed the stable version of ED (4.0.1). after the installation process was finished i got this error when i click in the backend on the joomla extension menu link from ED:

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 ')' at line 1 SQL=select count(1) from `#__discuss_thread` as a where a.`published` = '1' and a.`cluster_id` = '0' and a.`category_id` in ()