diff --git a/core/modules/user/src/Plugin/Action/ChangeUserRoleBase.php b/core/modules/user/src/Plugin/Action/ChangeUserRoleBase.php
index de4c404..8224860 100644
--- a/core/modules/user/src/Plugin/Action/ChangeUserRoleBase.php
+++ b/core/modules/user/src/Plugin/Action/ChangeUserRoleBase.php
@@ -50,7 +50,7 @@ public static function create(ContainerInterface $container, array $configuratio
    */
   public function defaultConfiguration() {
     return [
-      'rid' => '',
+      'rid' => NULL,
     ];
   }