diff --git a/apps/common/main/lib/util/themeinit.js b/apps/common/main/lib/util/themeinit.js
index 078565a972..d3614a509e 100644
--- a/apps/common/main/lib/util/themeinit.js
+++ b/apps/common/main/lib/util/themeinit.js
@@ -64,8 +64,8 @@
 
     let objtheme = window.uitheme.colors ? window.uitheme : localStorage.getItem("ui-theme");
     if ( !!objtheme ) {
-        if ( typeof(objtheme) == 'string' &&
-                objtheme.startsWith("{") && objtheme.endsWith("}") )
+        if ( typeof(objtheme) == 'string' && objtheme.lastIndexOf("{", 0) === 0 &&
+                objtheme.indexOf("}", objtheme.length - 1) !== -1 )
         {
             objtheme = JSON.parse(objtheme);
         }