diff --git a/adm/ajax.php b/adm/ajax.php
index 609f75d7..e8dc5d9f 100755
--- a/adm/ajax.php
+++ b/adm/ajax.php
@@ -127,7 +127,7 @@ if (isset($_GET['ajaxDiscountCustomers']))
 	$filter = Tools::getValue('filter');
 	
 	$filterWithIdCustomer = false;
-	if (strpos($filter, '_')) {
+	if (strpos($filter, '0_') === 0) {
 		$filterArray = explode('_', $filter);
 		$filter = $filterArray[1];
 		$filterWithIdCustomer = true;
diff --git a/adm/tabs/AdminDiscounts.php b/adm/tabs/AdminDiscounts.php
index d471536b..4eaaa36f 100755
--- a/adm/tabs/AdminDiscounts.php
+++ b/adm/tabs/AdminDiscounts.php
@@ -381,10 +381,11 @@ class AdminDiscounts extends AdminTab
 						function fillCustomersAjax()
 						{
 							var filterValue = \''.(($value = (int)($this->getFieldValue($obj, 'id_customer'))) ? '0_'.$value : (($value = (int)($this->getFieldValue($obj, 'id_group'))) ? '1_'.$value : '')).'\';
-							if ($(\'#filter\').val())
+							if ($(\'#filter\').val()) {
 								filterValue = $(\'#filter\').val();
+							}
 							$.ajaxSetup({ cache: false });
-							$.getJSON("'.dirname($currentIndex).'/ajax.php",{ajaxDiscountCustomers:1,filter:filterValue},
+							$.getJSON("'.dirname($currentIndex).'/ajax.php", {ajaxDiscountCustomers:1, filter:filterValue},
 								function(obj) {
 									var groups_length = obj.groups.length;
 									if (obj.groups.length == 0)