Good news: I found the problem and fixed...
Edit admin_users.php and find
PHP Code:
if ($_GET["mode"] == "edit"){ // edit user
// code to prevent CSRF
// doesn't matter if a token exists. if we're viewing this page, just
// create a new one or replace the existing.
$_SESSION['token_admin_users_edit'] = md5(uniqid(rand(), TRUE));
$_SESSION['token_time_admin_users_edit'] = time();
$main_smarty->assign('token_admin_users_edit', $_SESSION['token_admin_users_edit']);
// code to prevent CSRF
and change:
PHP Code:
$main_smarty->assign('token_admin_users_edit', $_SESSION['token_admin_users_edit']);
to
PHP Code:
$smarty->assign('token_admin_users_edit', $_SESSION['token_admin_users_edit']);
Here you go..!