diff --git a/htdocs/core/actions_addupdatedelete.inc.php b/htdocs/core/actions_addupdatedelete.inc.php
index 8364c139bae..a62fe016946 100644
--- a/htdocs/core/actions_addupdatedelete.inc.php
+++ b/htdocs/core/actions_addupdatedelete.inc.php
@@ -87,7 +87,7 @@ if ($action == 'add' && !empty($permissiontoadd)) {
 			$value = $tmparraykey[GETPOST($key)].','.GETPOST($key.'2');
 		} else {
 			if ($key == 'lang') {
-				$value = GETPOST($key, 'aZ09');
+				$value = GETPOST($key, 'aZ09')?GETPOST($key, 'aZ09'):"";
 			} else {
 				$value = GETPOST($key, 'alphanohtml');
 			}