diff --git a/htdocs/fourn/facture/document.php b/htdocs/fourn/facture/document.php
index 6926770bd91..818c016de04 100644
--- a/htdocs/fourn/facture/document.php
+++ b/htdocs/fourn/facture/document.php
@@ -54,6 +54,7 @@ $page = GETPOST("page",'int');
 if ($page == -1) {
     $page = 0;
 }
+$page = (is_numeric($page) ? $page : 0);
 $offset = $conf->liste_limit * $page;
 $pageprev = $page - 1;
 $pagenext = $page + 1;