diff --git a/htdocs/mailmanspip/class/mailmanspip.class.php b/htdocs/mailmanspip/class/mailmanspip.class.php
index de075eb2dc5..2e6cae459c1 100644
--- a/htdocs/mailmanspip/class/mailmanspip.class.php
+++ b/htdocs/mailmanspip/class/mailmanspip.class.php
@@ -1,11 +1,12 @@
 <?php
-/* Copyright (C) 2002-2003 Rodolphe Quiedeville <rodolphe@quiedeville.org>
- * Copyright (C) 2002-2003 Jean-Louis Bergamo   <jlb@j1b.org>
- * Copyright (C) 2004-2013 Laurent Destailleur  <eldy@users.sourceforge.net>
- * Copyright (C) 2004      Sebastien Di Cintio  <sdicintio@ressource-toi.org>
- * Copyright (C) 2004      Benoit Mortier       <benoit.mortier@opensides.be>
- * Copyright (C) 2009      Regis Houssin        <regis.houssin@capnetworks.com>
- * Copyright (C) 2012      Marcos García        <marcosgdf@gmail.com>
+/* Copyright (C) 2002-2003  Rodolphe Quiedeville    <rodolphe@quiedeville.org>
+ * Copyright (C) 2002-2003  Jean-Louis Bergamo      <jlb@j1b.org>
+ * Copyright (C) 2004-2013  Laurent Destailleur     <eldy@users.sourceforge.net>
+ * Copyright (C) 2004       Sebastien Di Cintio     <sdicintio@ressource-toi.org>
+ * Copyright (C) 2004       Benoit Mortier          <benoit.mortier@opensides.be>
+ * Copyright (C) 2009       Regis Houssin           <regis.houssin@capnetworks.com>
+ * Copyright (C) 2012       Marcos García           <marcosgdf@gmail.com>
+ * Copyright (C) 2018       Frédéric France         <frederic.france@netlogic.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -48,6 +49,11 @@ class MailmanSpip
 	 */
 	public $error='';
 
+    /**
+     * @var string[]	Array of error strings
+     */
+    public $errors = array();
+
     public $mladded_ok;
     public $mladded_ko;
     public $mlremoved_ok;