--- loncom/interface/coursecatalog.pm	2025/02/15 00:07:48	1.106
+++ loncom/interface/coursecatalog.pm	2025/02/24 13:40:33	1.107
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for displaying the course catalog interface
 #
-# $Id: coursecatalog.pm,v 1.106 2025/02/15 00:07:48 raeburn Exp $
+# $Id: coursecatalog.pm,v 1.107 2025/02/24 13:40:33 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1895,7 +1895,13 @@ sub courseinfo_row {
             @cats = split('&',$categories);
         }
         if ((ref($trails) eq 'ARRAY') && (ref($allitems) eq 'HASH')) {
-            my @categories = map { $trails->[$allitems->{$_}]; } @cats;
+            my @categories;
+            foreach my $cat (@cats) {
+                next if ($cat eq '');
+                if (($allitems->{$cat} ne '') && ($trails->[$allitems->{$cat}] ne '')) {
+                    push(@categories,$trails->[$allitems->{$cat}]);
+                }
+            }
             $categorylist = join('<br />',@categories);
         }
         if ($categorylist eq '') {