3.9.14. Error: Couldn't update private forum permissions

You get the following error everytime you try to make a particular user (or a site administrator) a moderator in PHP-Nuke 6.5-7.0:

Couldn't update private forum permissions
DEBUG MODE
SQL Error : 1064 You have an error in your SQL syntax near ' 1)' at line 2
INSERT INTO nuke_bbauth_access (forum_id, group_id, auth_mod) VALUES (3, , 1)
Line : 385
FIle: xxxx/modules/Forums/admin/admin_ug_auth.php

This is a bug modules/Forums/admin/admin_ug_auth.php - the INSERT statement is missing a string value in the VALUES clause. Try this admin_ug_auth.php instead. See Couldn't update private forum permissions and Site Admin & Moderator for more details.