diff --git a/lib/timeline/component/Group.js b/lib/timeline/component/Group.js
index 9117b31a63..0da493ac21 100644
--- a/lib/timeline/component/Group.js
+++ b/lib/timeline/component/Group.js
@@ -84,6 +84,7 @@ class Group {
     };
     this.checkRangedItems = false; // needed to refresh the ranged items if the window is programatically changed with NO overlap.
     const me = this;
+    this.itemSet.body.emitter.off("checkRangedItems") // prevent setGroup and setData from recreating this emitter
     this.itemSet.body.emitter.on("checkRangedItems", () => {
       me.checkRangedItems = true;
     })