Index: openacs-4/packages/assessment/www/last-session.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/assessment/www/last-session.tcl,v
diff -u -r1.5 -r1.6
--- openacs-4/packages/assessment/www/last-session.tcl	29 Sep 2013 13:40:40 -0000	1.5
+++ openacs-4/packages/assessment/www/last-session.tcl	27 Oct 2014 16:40:59 -0000	1.6
@@ -7,8 +7,8 @@
 	@author Eduardo Pérez Ureta (eperez@it.uc3m.es)
 	@creation-date 2004-09-03
 } {
-    assessment_id:notnull
-    {subject_id:integer,optional ""}
+    assessment_id:naturalnum,notnull
+    {subject_id:naturalnum,optional ""}
 } -properties {
     context:onevalue
     assessment_info:multirow
@@ -18,7 +18,7 @@
 
 set package_id [ad_conn package_id]
 
-if {[empty_string_p $subject_id]} {
+if {$subject_id eq ""} {
     set subject_id [ad_conn user_id]
 }