creating new group from backend results in mysql error

When trying to create a new group from the backend of the site, the following error is shown after pressing save & close:

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=UPDATE pacne_social_clusters SET `type` = '1' WHERE `id` IN ()

The group is not created then.

I am using joomla 3.3.6 & easysocial 1.3.13