diff --git a/layouts/partials/stylesheet.html b/layouts/partials/stylesheet.html
index aa9bc06e24..fd35d6d49e 100644
--- a/layouts/partials/stylesheet.html
+++ b/layouts/partials/stylesheet.html
@@ -27,7 +27,9 @@
       }
       function markTheme( theme ){
         var select = document.querySelector( '#select-theme' );
-        select.value = theme;
+        if( select ){
+          select.value = theme;
+        }
       }
       function changeTheme( theme, noanimation ){
         if( !theme ){