Index: lams_monitoring/web/includes/javascript/monitorLesson.js
===================================================================
diff -u -ra7777b3f9553c43bc08ed62d8d87dc7016ac0700 -r449847476facd8c4e2486f0f19799d199eb25f84
--- lams_monitoring/web/includes/javascript/monitorLesson.js	(.../monitorLesson.js)	(revision a7777b3f9553c43bc08ed62d8d87dc7016ac0700)
+++ lams_monitoring/web/includes/javascript/monitorLesson.js	(.../monitorLesson.js)	(revision 449847476facd8c4e2486f0f19799d199eb25f84)
@@ -1334,6 +1334,13 @@
 			updateLiveEdit();
 			
 			sequenceRefreshInProgress = false;
+		},
+		error : function(jqXHR, textStatus){
+			if (textStatus === 'parsererror') {
+				alert('Lesson monitoring periodic auto update failed and will be stopped.\n' +
+				      'If you have logged out, please close this window.\nOtherwise please refresh the page.')
+				autoRefreshBlocked = true;
+			}
 		}
 	});
 }