diff --git a/src/Umbraco.Web.UI.Client/src/common/services/iconhelper.service.js b/src/Umbraco.Web.UI.Client/src/common/services/iconhelper.service.js
index 04194838ab..a57fd606aa 100644
--- a/src/Umbraco.Web.UI.Client/src/common/services/iconhelper.service.js
+++ b/src/Umbraco.Web.UI.Client/src/common/services/iconhelper.service.js
@@ -166,7 +166,13 @@ function iconHelper($q, $timeout) {
                     var c = ".icon-";
 
                     for (var i = document.styleSheets.length - 1; i >= 0; i--) {
-                        var classes = document.styleSheets[i].rules || document.styleSheets[i].cssRules;
+                        var classes = null;
+                        try {
+                            classes = document.styleSheets[i].rules || document.styleSheets[i].cssRules;
+                        } catch (e) {
+                            console.warn("Can't read the css rules of: " + document.styleSheets[i].href, e);
+                            continue;
+                        }
                         
                         if (classes !== null) {
                             for(var x=0;x<classes.length;x++) {
@@ -224,4 +230,4 @@ function iconHelper($q, $timeout) {
         }
     };
 }
-angular.module('umbraco.services').factory('iconHelper', iconHelper);
\ No newline at end of file
+angular.module('umbraco.services').factory('iconHelper', iconHelper);