diff --git a/admin.php b/admin.php
index b66378e73..dc848ab49 100644
--- a/admin.php
+++ b/admin.php
@@ -154,7 +154,6 @@ if (count($page['infos']) != 0)
 }
 
 $template->parse('admin');
-include(PHPWG_ROOT_PATH.'include/page_tail.php');
 
 // +-----------------------------------------------------------------------+
 // |                     order permission refreshment                      |
@@ -179,11 +178,8 @@ if (
     )
   )
 {
-  $query = '
-UPDATE '.USER_CACHE_TABLE.'
-  SET need_update = \'true\'
-;';
-  pwg_query($query);
+  invalidate_user_cache();
 }
 
+include(PHPWG_ROOT_PATH.'include/page_tail.php');
 ?>
diff --git a/admin/include/functions.php b/admin/include/functions.php
index 6e97e3908..66deb5777 100644
--- a/admin/include/functions.php
+++ b/admin/include/functions.php
@@ -2013,4 +2013,16 @@ function pwg_URL()
   return $urls;
 }
 
+/**
+ * Invalidates cahed data (permissions and category counts) for all users.
+ */
+function invalidate_user_cache()
+{
+  $query = '
+UPDATE '.USER_CACHE_TABLE.'
+  SET need_update = \'true\'
+;';
+  pwg_query($query);
+  trigger_action('invalidate_user_cache');
+}
 ?>