From aca3406249a0f7138d956aad2f2e4d3e3a64b8e2 Mon Sep 17 00:00:00 2001
From: marrionluaka <marrion91300@gmail.com>
Date: Tue, 19 Sep 2023 16:42:26 -0700
Subject: [PATCH] Fixing channel messaging type error

---
 channel-messaging-basic/page2.html | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/channel-messaging-basic/page2.html b/channel-messaging-basic/page2.html
index 3929fec5..d5d36c11 100644
--- a/channel-messaging-basic/page2.html
+++ b/channel-messaging-basic/page2.html
@@ -14,6 +14,8 @@
       window.addEventListener("message", onMessage);
 
       function onMessage(e) {
+        if (!e.ports) return;
+
         output.innerHTML = e.data;
         // Use the transfered port to post a message back to the main frame
         e.ports[0].postMessage("Message back from the IFrame");