--- loncom/interface/courseprefs.pm	2014/06/13 02:03:41	1.49.2.15
+++ loncom/interface/courseprefs.pm	2014/09/24 04:43:28	1.49.2.16
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler to set configuration settings for a course
 #
-# $Id: courseprefs.pm,v 1.49.2.15 2014/06/13 02:03:41 raeburn Exp $
+# $Id: courseprefs.pm,v 1.49.2.16 2014/09/24 04:43:28 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2625,9 +2625,9 @@ sub display_loncaparev_constraints {
         }
         foreach my $map (keys(%allmaps)) {
             my $mapres = $navmap->getResourceByUrl($map);
-            my $mapsymb = $mapres->symb();
-            $toshow{$mapsymb} = 1;
             if (ref($mapres)) {
+                my $mapsymb = $mapres->symb();
+                $toshow{$mapsymb} = 1;
                 my $pcslist = $mapres->map_hierarchy();
                 if ($pcslist ne '') {
                     foreach my $pc (split(/,/,$pcslist)) {