From a98beb13db82b692d32aa0e6e0b0befabbbaa386 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=A9ry=20Debongnie?= <ged@odoo.com>
Date: Mon, 5 Feb 2018 20:24:23 +0100
Subject: [PATCH] [FIX] web_editor: correct check of 'rules' property

see issue #22517
---
 addons/web_editor/static/src/js/transcoder.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/addons/web_editor/static/src/js/transcoder.js b/addons/web_editor/static/src/js/transcoder.js
index ca6f751f954..b0831832dd6 100644
--- a/addons/web_editor/static/src/js/transcoder.js
+++ b/addons/web_editor/static/src/js/transcoder.js
@@ -13,7 +13,7 @@ var getMatchedCSSRules = function (a) {
         var sheets = document.styleSheets;
         for(var i = sheets.length-1; i >= 0 ; i--) {
             var rules;
-            if (sheets[i].rules) {
+            if (sheets[i].hasOwnProperty('rules')) {
                 rules = sheets[i].rules;
             } else {
                 //try...catch because Firefox not able to enumerate document.styleSheets[].cssRules[] for cross-domain stylesheets.