--- loncom/interface/lonhtmlcommon.pm	2021/04/29 17:45:22	1.398
+++ loncom/interface/lonhtmlcommon.pm	2021/10/26 02:31:22	1.400
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # a pile of common html routines
 #
-# $Id: lonhtmlcommon.pm,v 1.398 2021/04/29 17:45:22 raeburn Exp $
+# $Id: lonhtmlcommon.pm,v 1.400 2021/10/26 02:31:22 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1917,6 +1917,16 @@ returns: nothing
         # The first one should be the course or a menu link
         if (!defined($menulink)) { $menulink=1; }
         if ($menulink) {
+            if ($env{'request.course.id'}) {
+                my ($menucoll,$deeplinkmenu,$menuref) = &Apache::loncommon::menucoll_in_effect();
+                if (($menucoll) && (ref($menuref) eq 'HASH')) {
+                    if ($menuref->{'main'} eq 'n') {
+                       undef($menulink);
+                    }
+                }
+            }
+        }
+        if ($menulink) {
             my $description = 'Menu';
             my $no_mt_descr = 0;
             if ((exists($env{'request.course.id'})) && 
@@ -3423,12 +3433,18 @@ PARAMSONE
         if (itemid != null) {
             itemh = itemid.offsetHeight;
         }
-        var primaryheight = document.getElementById('LC_nav_bar').offsetHeight;
-        var secondaryheight;
+        var primaryheight = 0;
+        if (document.getElementById('LC_nav_bar') != null) { 
+            primaryheight = document.getElementById('LC_nav_bar').offsetHeight;
+        }
+        var secondaryheight = 0;
         if (document.getElementById('LC_secondary_menu') != null) { 
             secondaryheight = document.getElementById('LC_secondary_menu').offsetHeight;
         }
-        var crumbsheight = document.getElementById('LC_breadcrumbs').offsetHeight;
+        var crumbsheight = 0;
+        if (document.getElementById('LC_breadcrumbs') != null) {
+            crumbsheight = document.getElementById('LC_breadcrumbs').offsetHeight;
+        }
         var dccidheight = 0;
         if (document.getElementById('dccid') != null) {
             dccidheight = document.getElementById('dccid').offsetHeight;