diff --git a/htdocs/accountancy/admin/card.php b/htdocs/accountancy/admin/card.php
index 97d2509b898..38ba420751b 100644
--- a/htdocs/accountancy/admin/card.php
+++ b/htdocs/accountancy/admin/card.php
@@ -42,7 +42,7 @@ $ref = GETPOST('ref', 'alpha');
 $rowid = GETPOST('rowid', 'int');
 $cancel = GETPOST('cancel', 'alpha');
 
-$account_number = GETPOST('account_number', 'string');
+$account_number = GETPOST('account_number', 'alphanohtml');
 $label = GETPOST('label', 'alpha');
 
 // Security check
diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index b5719d388f3..3de24dcbf09 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -11,6 +11,7 @@
  * Copyright (C) 2015       Raphaël Doursenaud      <rdoursenaud@gpcsolutions.fr>
  * Copyright (C) 2016       Charlie Benke           <charlie@patas-monkey.com>
  * Copyright (C) 2018-2022  Frédéric France         <frederic.france@netlogic.fr>
+ * Copyright (C) 2023		Benjamin Falière		<benjamin.faliere@altairis.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
@@ -1466,7 +1467,7 @@ class Categorie extends CommonObject
 		$ways = array();
 
 		$parents = $this->get_meres();
-		if (!empty($parents)) {
+		if (is_array($parents)) {
 			foreach ($parents as $parent) {
 				$allways = $parent->get_all_ways();
 				foreach ($allways as $way) {