Alex Pott
--- a/modules/users_jwt/src/Authentication/Provider/UsersJwtAuth.php
+++ b/modules/users_jwt/src/Authentication/Provider/UsersJwtAuth.php
   * @param string|null $jwt_class
   *   The JWT library class.
   */
-  public function __construct(UsersJwtKeyRepositoryInterface $key_repository, EntityTypeManagerInterface $entity_type_manager, Settings $settings, LoggerChannelFactoryInterface $logger_factory, string $jwt_class = NULL) {
+  public function __construct(UsersJwtKeyRepositoryInterface $key_repository, EntityTypeManagerInterface $entity_type_manager, Settings $settings, LoggerChannelFactoryInterface $logger_factory, ?string $jwt_class = NULL) {