I am running phpNUKE 7.6 Platuim, trying to delete user then...

Could not delete group for this user

DEBUG MODE

SQL Error : 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 2

DELETE FROM nuke_bbgroups WHERE group_id =

Line : 307
File : /home/www/mysite.com/modules/Forums/admin/admin_userlist.php

any help??
Thanks