diff --git a/htdocs/alumni/core/modules/mailings/mailing_alumni_selector1.modules.php b/htdocs/alumni/core/modules/mailings/mailing_alumni_selector1.modules.php
index 2be0aba5a..aa7f48322 100644
--- a/htdocs/alumni/core/modules/mailings/mailing_alumni_selector1.modules.php
+++ b/htdocs/alumni/core/modules/mailings/mailing_alumni_selector1.modules.php
@@ -131,7 +131,7 @@ public function add_to_target($mailing_id)
 		$extrafields->fetch_name_optionals_label($tmp->table_element);
 		
 		foreach($extrafields->attributes[$tmp->table_element]['label'] as $key => $label) {
-			if (GETPOST($key)) {
+			if (GETPOSTISSET($key)) {
 				$sql .= " AND ase.".$this->db->sanitize($key)." LIKE '".$this->db->escape(GETPOST($key))."'";
 			}
 		}