Index: lams_tool_leader/src/java/org/lamsfoundation/lams/tool/leaderselection/web/controller/MonitoringController.java
===================================================================
diff -u -r30b838c2ace64169f440c86a9756fd0959cf2323 -rabc78aedaadb945b0be06d159b956712391fc296
--- lams_tool_leader/src/java/org/lamsfoundation/lams/tool/leaderselection/web/controller/MonitoringController.java	(.../MonitoringController.java)	(revision 30b838c2ace64169f440c86a9756fd0959cf2323)
+++ lams_tool_leader/src/java/org/lamsfoundation/lams/tool/leaderselection/web/controller/MonitoringController.java	(.../MonitoringController.java)	(revision abc78aedaadb945b0be06d159b956712391fc296)
@@ -183,8 +183,8 @@
 	    }
 	}
 
-	if (group == null) {
-	    throw new InvalidParameterException("No group with ID " + groupId
+	if (targetSession == null) {
+	    throw new InvalidParameterException("No session for group with ID " + groupId
 		    + " found for Leader Selection with tool content ID " + leaderSelectionToolContentId);
 	}