Index: openacs-4/packages/acs-subsite/www/group-leave.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/www/group-leave.tcl,v
diff -u -r1.2.20.1 -r1.2.20.2
--- openacs-4/packages/acs-subsite/www/group-leave.tcl	27 Aug 2013 12:20:37 -0000	1.2.20.1
+++ openacs-4/packages/acs-subsite/www/group-leave.tcl	5 Aug 2014 09:49:23 -0000	1.2.20.2
@@ -5,7 +5,7 @@
     @creation-date 2003-08-07
     @cvs-id $Id$
 } {
-    {group_id:integer {[application_group::group_id_from_package_id]}}
+    {group_id:naturalnum,notnull {[application_group::group_id_from_package_id]}}
     return_url:optional
 }