Index: lams_monitoring/web/includes/javascript/monitorLesson.js
===================================================================
RCS file: /usr/local/cvsroot/lams_monitoring/web/includes/javascript/monitorLesson.js,v
diff -u -r1.44.2.1 -r1.44.2.2
--- lams_monitoring/web/includes/javascript/monitorLesson.js	4 Aug 2014 08:07:42 -0000	1.44.2.1
+++ lams_monitoring/web/includes/javascript/monitorLesson.js	2 Sep 2014 21:56:53 -0000	1.44.2.2
@@ -1746,6 +1746,10 @@
  * Escapes HTML tags to prevent XSS injection.
  */
 function escapeHtml(unsafe) {
+	if (unsafe == undefined) {
+		return "";
+	}
+	
     return unsafe
         .replace(/&/g, "&")
         .replace(/</g, "&lt;")