Index: openacs-4/packages/chat/www/chat.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/chat/www/chat.tcl,v
diff -u -r1.15 -r1.16
--- openacs-4/packages/chat/www/chat.tcl	17 Jun 2016 17:36:11 -0000	1.15
+++ openacs-4/packages/chat/www/chat.tcl	20 Jun 2016 08:37:04 -0000	1.16
@@ -7,7 +7,7 @@
     @creation-date November 22, 2000
     @cvs-id $Id$
 } {
-    room_id
+    room_id:naturalnum,notnull
   {client "ajax"}
     {message:html ""}
 } -properties {