diff --git a/core/class/template.class.php b/core/class/template.class.php
index f71fc6f9..d7c6a90c 100644
--- a/core/class/template.class.php
+++ b/core/class/template.class.php
@@ -488,7 +488,7 @@ class template
         switch ($langId) {
             case '':
                 break;
-            case in_array($langId, core::$languages):
+            case array_key_exists($langId, core::$languages):
                 $lang = $langId;
                 break;
             case 'selected':