diff --git a/apps/common/main/lib/util/themeinit.js b/apps/common/main/lib/util/themeinit.js
index e2ba2f5fd8..8cd8fcbf21 100644
--- a/apps/common/main/lib/util/themeinit.js
+++ b/apps/common/main/lib/util/themeinit.js
@@ -123,7 +123,7 @@
             }
         }
     } else {
-        if ( window.uitheme.id.lastIndexOf("theme-gray", 0) === 0 ) {
+        if ( window.uitheme.id && window.uitheme.id.lastIndexOf("theme-gray", 0) === 0 ) {
             header_tokens.forEach(function (i) {
                 !!document.documentElement.style.setProperty('--' + i, "#f7f7f7");
             });