Index: lams_central/web/includes/javascript/authoring/authoringGeneral.js
===================================================================
diff -u -r9eebc760f5946d43fb9971a84d5198541077b69c -r7a3f0b4333c6c3aba00560735a50b610f76d1029
--- lams_central/web/includes/javascript/authoring/authoringGeneral.js	(.../authoringGeneral.js)	(revision 9eebc760f5946d43fb9971a84d5198541077b69c)
+++ lams_central/web/includes/javascript/authoring/authoringGeneral.js	(.../authoringGeneral.js)	(revision 7a3f0b4333c6c3aba00560735a50b610f76d1029)
@@ -1594,6 +1594,9 @@
 		var firstGroupingActivity = firstActivity instanceof ActivityDefs.GroupingActivity ? firstActivity : null;
 		if (!firstGroupingActivity) {
 			firstGroupingActivity = getNextActivity(firstActivity);
+			if (!firstGroupingActivity) {
+				return null;
+			}
 			if (!(firstGroupingActivity instanceof ActivityDefs.GroupingActivity)){
 				firstGroupingActivity = getNextActivity(firstGroupingActivity);
 				if (!(firstGroupingActivity instanceof ActivityDefs.GroupingActivity)){