diff --git a/modules/blocklayered/blocklayered-ajax-back.php b/modules/blocklayered/blocklayered-ajax-back.php
index 409a6ae90..f10c9fb5d 100644
--- a/modules/blocklayered/blocklayered-ajax-back.php
+++ b/modules/blocklayered/blocklayered-ajax-back.php
@@ -34,10 +34,12 @@ if (substr(Tools::encrypt('blocklayered/index'),0,10) != Tools::getValue('layere
 
 include(dirname(__FILE__).'/blocklayered.php');
 
+$category_box = Tools::getValue('categoryBox');
+
 /* Clean categoryBox before use */
-if (isset($_GET['categoryBox']) AND is_array($_GET['categoryBox']))
-	foreach ($_GET['categoryBox'] AS &$value)
+if (is_array($category_box))
+	foreach ($category_box AS &$value)
 		$value = (int)$value;
 
 $blockLayered = new BlockLayered();
-echo $blockLayered->ajaxCallBackOffice(Tools::getValue('categoryBox'), Tools::getValue('id_layered_filter'));
+echo $blockLayered->ajaxCallBackOffice($category_box, Tools::getValue('id_layered_filter'));
diff --git a/modules/blocklayered/blocklayered.php b/modules/blocklayered/blocklayered.php
index 5cd7be2f0..1aebfad01 100644
--- a/modules/blocklayered/blocklayered.php
+++ b/modules/blocklayered/blocklayered.php
@@ -3198,8 +3198,6 @@ class BlockLayered extends Module
 	{
 		global $cookie;
 		
-		$categoryBox = array();
-		
 		if (!empty($id_layered_filter))
 		{
 			$layeredFilter = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('SELECT * FROM '._DB_PREFIX_.'layered_filter WHERE id_layered_filter = '.(int)$id_layered_filter);