From b349ab79a6638426a8ba95a646bfc52fb0aba8bc Mon Sep 17 00:00:00 2001
From: yflory <yann.flory@xwiki.com>
Date: Tue, 19 Oct 2021 14:25:07 +0200
Subject: [PATCH] Fix type error

---
 www/unsafeiframe/main.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/www/unsafeiframe/main.js b/www/unsafeiframe/main.js
index 5cecc11bf..c36d4f641 100644
--- a/www/unsafeiframe/main.js
+++ b/www/unsafeiframe/main.js
@@ -31,6 +31,7 @@ define([
             // loading screen setup.
             var done = waitFor();
             var onMsg = function (msg) {
+                if (!msg || !msg.data) { return; }
                 var data = typeof(msg.data) === "object" ? msg.data : JSON.parse(msg.data);
                 if (data.q !== 'READY') { return; }
                 window.removeEventListener('message', onMsg);