diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index c16d2e8..bd59629 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -2,10 +2,10 @@
 /**
  * Nextcloud - user_sql
  *
- * @copyright 2018 Marcin Łojewski <dev@mlojewski.me>
- * @author    Marcin Łojewski <dev@mlojewski.me>
  * @copyright 2025 Claus-Justus Heine <himself@claus-justus-heine.de>
  * @author    Claus-Justus Heine <himself@claus-justus-heine.de>
+ * @copyright 2018 Marcin Łojewski <dev@mlojewski.me>
+ * @author    Marcin Łojewski <dev@mlojewski.me>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -63,6 +63,9 @@ class Application extends App implements IBootstrap
 			IGroupManager $groupManager,
 			Backend\GroupBackend $groupBackend,
 		) {
+			if (!$userBackend->isConfigured() || !$groupBackend->isConfigured()) {
+				return;
+			}
 			$userManager->registerBackend($userBackend);
 			$groupManager->addBackend($groupBackend);
 		});