Error in SVN 5221 Access control plugin

[george1421]

When I installed the access control plugin and then activated it the page turned white with no response for a minute (probably longer since I did not want to wait).

In the http error log there was this error.

PHP Fatal error:  Call to a member function isValid() on null in /var/www/html/fog/lib/plugins/accesscontrol/hooks/RemoveMenuItems.hook.php on line 13, referer: http://10.12.1.88/fog/management/index.php?node=plugin&sub=install&run=bd6bf52053b1ddb064bd3c493bfc47ef&plug_name=accesscontrol&install=bd6bf52053b1ddb064bd3c493bfc47ef&plug_name=accesscontrol

Refreshing the management page created this error.

PHP Fatal error:  Call to a member function isValid() on null in /var/www/html/fog/lib/plugins/accesscontrol/hooks/RemoveMenuItems.hook.php on line 13

I seem to remember this same issue when I upgraded from a svn trunk to the next svn trunk sometime in the past.