Index: lams_tool_assessment/web/includes/javascript/chart.js
===================================================================
diff -u -r62f565df2936fcc7978cb55d3e6b3f9f5a9621a5 -rc33d4aa11d22778bd16a874f0a95237da3f2f10c
--- lams_tool_assessment/web/includes/javascript/chart.js	(.../chart.js)	(revision 62f565df2936fcc7978cb55d3e6b3f9f5a9621a5)
+++ lams_tool_assessment/web/includes/javascript/chart.js	(.../chart.js)	(revision c33d4aa11d22778bd16a874f0a95237da3f2f10c)
@@ -1,8 +1,11 @@
 function drawCompletionCharts(toolContentId, useGroups, animate) {
 	
-	const source = new EventSource( WEB_APP_URL + 'monitoring/getCompletionChartsDataFlux.do?toolContentId=' + toolContentId);
+	const source = new EventSource( WEB_APP_URL + 'monitoring/getCompletionChartsData.do?toolContentId=' + toolContentId);
 
 	source.onmessage = function (event) {
+		if (!event.data) {
+			return;
+		}
 		var data = JSON.parse(event.data);
 		drawActivityCompletionChart(data, animate);
 		drawAnsweredQuestionsChart(data, useGroups, animate);