fixed #858

lib/timeline/component/ItemSet.js

@@ -708,7 +708,7 @@ ItemSet.prototype.setGroups = function(groups) {
   // unsubscribe from current dataset
   if (this.groupsData) {
     util.forEach(this.groupListeners, function (callback, event) {
-      me.groupsData.unsubscribe(event, callback);
+      me.groupsData.off(event, callback);
     });
 
     // remove all drawn groups

lib/timeline/component/LineGraph.js

@@ -324,7 +324,7 @@ LineGraph.prototype.setGroups = function(groups) {
   // unsubscribe from current dataset
   if (this.groupsData) {
     util.forEach(this.groupListeners, function (callback, event) {
-      me.groupsData.unsubscribe(event, callback);
+      me.groupsData.off(event, callback);
     });
 
     // remove all drawn groups