diff --git a/js/src/dom/event-handler.js b/js/src/dom/event-handler.js
index 8ccb887fc3bf..3293f397d559 100644
--- a/js/src/dom/event-handler.js
+++ b/js/src/dom/event-handler.js
@@ -170,7 +170,7 @@ function addHandler(element, originalTypeEvent, handler, delegationFn, oneOff) {
   if (customEventsRegex.test(originalTypeEvent)) {
     const wrapFn = fn => {
       return function (event) {
-        if (!event.relatedTarget || (event.relatedTarget !== event.delegateTarget && event.relatedTarget.contains(event.delegateTarget))) {
+        if (!event.relatedTarget || (event.relatedTarget !== event.delegateTarget && !event.delegateTarget.contains(event.relatedTarget))) {
           return fn.call(this, event)
         }
       }