--- rat/lonsequence.pm	2017/09/03 18:52:23	1.47
+++ rat/lonsequence.pm	2017/09/04 23:47:17	1.48
@@ -2,7 +2,7 @@
 #
 # Sequence Handler
 #
-# $Id: lonsequence.pm,v 1.47 2017/09/03 18:52:23 raeburn Exp $
+# $Id: lonsequence.pm,v 1.48 2017/09/04 23:47:17 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -256,12 +256,16 @@ sub handler {
                                   href  => "javascript:gopost('/adm/navmaps','')"});
                    my $res = $navmap->getResourceByUrl($mapurl);
                    if (ref($res)) {
-                       my ($parent) = &Apache::lonnet::decode_symb($res->symb());
-                       if ($parent ne $env{'course.'.$env{'request.course.id'}.'.url'}) {
-                           my @mapcrumbs = $navmap->recursed_crumbs($parent);
-                           if (@mapcrumbs) {
-                               push(@crumbs,@mapcrumbs);
+                       my $symb = $res->symb();
+                       if ($symb) {
+                           my ($parent) = &Apache::lonnet::decode_symb($res->symb());
+                           if ($parent ne $env{'course.'.$env{'request.course.id'}.'.url'}) {
+                               my @mapcrumbs = $navmap->recursed_crumbs($parent);
+                               if (@mapcrumbs) {
+                                   push(@crumbs,@mapcrumbs);
+                               }
                            }
+                           $env{'request.symb'} = $symb;
                        }
                    }
                    my $maptitle = &Apache::lonnet::gettitle($mapurl);