--- loncom/interface/loncourserespicker.pm	2014/01/08 17:18:11	1.11
+++ loncom/interface/loncourserespicker.pm	2015/04/09 17:57:05	1.12
@@ -1,6 +1,6 @@
 # The LearningOnline Network
 #
-# $Id: loncourserespicker.pm,v 1.11 2014/01/08 17:18:11 bisitz Exp $
+# $Id: loncourserespicker.pm,v 1.12 2015/04/09 17:57:05 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -693,10 +693,12 @@ function writeToOpener(maps,resources) {
                 }
             }
             if (isResource == 1) {
-                if (nesting[elemnum].length > 0) {
-                    var lastelem = nesting[elemnum].length-1;
-                    if (document.$formname.elements[nesting[elemnum][lastelem]].checked) {
-                        include = 0;
+                if (nesting[elemnum] != null) {
+                    if (nesting[elemnum].length > 0) {
+                        var lastelem = nesting[elemnum].length-1;
+                        if (document.$formname.elements[nesting[elemnum][lastelem]].checked) {
+                            include = 0;
+                        }
                     }
                 }
             }