Change null to array(null)

API/script/Gateway/GatewayUser.php

@@ -23,7 +23,7 @@ class GatewayUser
         }
     }
 
-    public function getUserPassword(string $login): ?array
+    public function getUserPassword(string $login): array
     {
         $query = "SELECT id,password FROM `user` WHERE login = :login";
         $this->connection->executeQuery($query, array(
@@ -31,7 +31,7 @@ class GatewayUser
         ));
         $result = $this->connection->getResults();
         if(empty($result))
-            return null;
+            return array(null,null);
         return $result[0];
     }