--- loncom/auth/lonroles.pm	2002/11/13 16:54:59	1.45
+++ loncom/auth/lonroles.pm	2002/11/25 16:05:56	1.46
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # User Roles Screen
 #
-# $Id: lonroles.pm,v 1.45 2002/11/13 16:54:59 www Exp $
+# $Id: lonroles.pm,v 1.46 2002/11/25 16:05:56 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -242,6 +242,7 @@ ENDHEADER
         my $button = 1;
         if ($envkey=~/^user\.role\./) {
 	    my (undef,undef,$role,@pwhere)=split(/\./,$envkey);
+            next if (!defined($role) || $role eq '');
             my $where=join('.',@pwhere);
             my $trolecode=$role.'.'.$where;
             my ($tstart,$tend)=split(/\./,$ENV{$envkey});