Index: openacs-4/packages/notifications/www/subscribers.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/notifications/www/subscribers.tcl,v
diff -u -r1.4 -r1.4.8.1
--- openacs-4/packages/notifications/www/subscribers.tcl	27 Oct 2008 16:14:16 -0000	1.4
+++ openacs-4/packages/notifications/www/subscribers.tcl	6 Aug 2014 11:07:26 -0000	1.4.8.1
@@ -9,7 +9,7 @@
     @creation-date 2008-01-13
     @cvs-id $Id$
 } {
-    object_id:notnull
+    object_id:naturalnum,notnull
 }
 
 permission::require_permission -object_id $object_id -privilege "admin"