diff --git a/adm/tabs/AdminCategories.php b/adm/tabs/AdminCategories.php
index 61090f3c..84061d92 100755
--- a/adm/tabs/AdminCategories.php
+++ b/adm/tabs/AdminCategories.php
@@ -102,6 +102,8 @@ class AdminCategories extends AdminTab
     
     protected function displayListTree()
     {
+        global $currentIndex;
+        
         if ($this->_category->id_category == 1) {
             echo "";
         }