diff --git a/src/timeline/Range.js b/src/timeline/Range.js
index 252ec469..d90dc840 100644
--- a/src/timeline/Range.js
+++ b/src/timeline/Range.js
@@ -7,7 +7,6 @@
  * @param {Object} [options]    See description at Range.setOptions
  */
 function Range(timeline, options) {
-  this.id = util.randomUUID();
   this.start = null; // Number
   this.end = null;   // Number
 
diff --git a/src/timeline/component/ItemSet.js b/src/timeline/component/ItemSet.js
index cdaf2b82..f5dc7101 100644
--- a/src/timeline/component/ItemSet.js
+++ b/src/timeline/component/ItemSet.js
@@ -26,26 +26,26 @@ function ItemSet(timeline, options) {
   // listeners for the DataSet of the items
   this.itemListeners = {
     'add': function (event, params, senderId) {
-      if (senderId != me.id) me._onAdd(params.items);
+      me._onAdd(params.items);
     },
     'update': function (event, params, senderId) {
-      if (senderId != me.id) me._onUpdate(params.items);
+      me._onUpdate(params.items);
     },
     'remove': function (event, params, senderId) {
-      if (senderId != me.id) me._onRemove(params.items);
+      me._onRemove(params.items);
     }
   };
 
   // listeners for the DataSet of the groups
   this.groupListeners = {
     'add': function (event, params, senderId) {
-      if (senderId != me.id) me._onAddGroups(params.items);
+      me._onAddGroups(params.items);
     },
     'update': function (event, params, senderId) {
-      if (senderId != me.id) me._onUpdateGroups(params.items);
+      me._onUpdateGroups(params.items);
     },
     'remove': function (event, params, senderId) {
-      if (senderId != me.id) me._onRemoveGroups(params.items);
+      me._onRemoveGroups(params.items);
     }
   };