diff --git a/apps/common/main/lib/controller/Themes.js b/apps/common/main/lib/controller/Themes.js
index a6aa6cced..67d095eb5 100644
--- a/apps/common/main/lib/controller/Themes.js
+++ b/apps/common/main/lib/controller/Themes.js
@@ -249,12 +249,11 @@ define([
                 var theme_name = get_ui_theme_name(Common.localStorage.getItem('ui-theme'));
                 if ( !theme_name ) {
                     if ( !(Common.Utils.isIE10 || Common.Utils.isIE11) )
-                        for (var i of document.body.classList.entries()) {
-                            if ( i[1].startsWith('theme-') && !i[1].startsWith('theme-type-') ) {
-                                theme_name = i[1];
-                                break;
+                        document.body.classList.forEach(function (classname, i, o) {
+                            if ( !theme_name && classname.startsWith('theme-') && !classname.startsWith('theme-type-') ) {
+                                theme_name = classname;
                             }
-                        }
+                        });
                 }
 
                 if ( !themes_map[theme_name] )