diff --git a/htdocs/product/reassort.php b/htdocs/product/reassort.php
index 4bade1db2cf..959f2377d9d 100644
--- a/htdocs/product/reassort.php
+++ b/htdocs/product/reassort.php
@@ -1,7 +1,7 @@
 <?php
 /* Copyright (C) 2001-2006  Rodolphe Quiedeville    <rodolphe@quiedeville.org>
  * Copyright (C) 2004-2015  Laurent Destailleur     <eldy@users.sourceforge.net>
- * Copyright (C) 2005-2012  Regis Houssin           <regis.houssin@capnetworks.com>
+ * Copyright (C) 2005-2018  Regis Houssin           <regis.houssin@capnetworks.com>
  * Copyright (C) 2013       Cédric Salvador         <csalvador@gpcsolutions.fr>
  * Copyright (C) 2015       Raphaël Doursenaud      <rdoursenaud@gpcsolutions.fr>
  *
@@ -57,6 +57,7 @@ $page = GETPOST("page",'int');
 if (! $sortfield) $sortfield="p.ref";
 if (! $sortorder) $sortorder="ASC";
 $limit = GETPOST('limit','int')?GETPOST('limit','int'):$conf->liste_limit;
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $limit * $page ;
 
 // Load sale and categ filters
diff --git a/htdocs/product/reassortlot.php b/htdocs/product/reassortlot.php
index 7b82408cfc0..b4d14ef1231 100644
--- a/htdocs/product/reassortlot.php
+++ b/htdocs/product/reassortlot.php
@@ -1,7 +1,7 @@
 <?php
 /* Copyright (C) 2001-2006  Rodolphe Quiedeville    <rodolphe@quiedeville.org>
  * Copyright (C) 2004-2016  Laurent Destailleur     <eldy@users.sourceforge.net>
- * Copyright (C) 2005-2012  Regis Houssin           <regis.houssin@capnetworks.com>
+ * Copyright (C) 2005-2018  Regis Houssin           <regis.houssin@capnetworks.com>
  * Copyright (C) 2013       Cédric Salvador         <csalvador@gpcsolutions.fr>
  * Copyright (C) 2015       Raphaël Doursenaud      <rdoursenaud@gpcsolutions.fr>
  * Copyright (C) 2016       Ferran Marcet			<fmarcet@2byte.es>
@@ -61,6 +61,7 @@ $page = GETPOST("page",'int');
 if (! $sortfield) $sortfield="p.ref";
 if (! $sortorder) $sortorder="ASC";
 $limit = GETPOST('limit','int')?GETPOST('limit','int'):$conf->liste_limit;
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $limit * $page ;
 
 // Load sale and categ filters