--- loncom/interface/spreadsheet/assesscalc.pm	2007/01/23 01:36:26	1.58
+++ loncom/interface/spreadsheet/assesscalc.pm	2012/10/12 13:56:38	1.59
@@ -1,5 +1,5 @@
 #
-# $Id: assesscalc.pm,v 1.58 2007/01/23 01:36:26 albertel Exp $
+# $Id: assesscalc.pm,v 1.59 2012/10/12 13:56:38 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -156,7 +156,7 @@ sub initialize {
     if (! defined($navmap)) {
         $navmap = Apache::lonnavmaps::navmap->new();
     }
-    if (!defined($navmap)) {
+    if ((!defined($navmap)) || (!ref($navmap))) {
         &Apache::lonnet::logthis('assesscalc:Can not open Coursemap');
     }
     &Apache::loncoursedata::clear_internal_caches();