diff --git a/src/Service/CustomAdminMenuManager.php b/src/Service/CustomAdminMenuManager.php
index d34a861ae8c4786cdcec9f9d371adce80fafc483..435ccaae7ab0269b9098612e102aa5cea9af20bc 100644
--- a/src/Service/CustomAdminMenuManager.php
+++ b/src/Service/CustomAdminMenuManager.php
@@ -233,7 +233,7 @@ class CustomAdminMenuManager implements TrustedCallbackInterface {
    * @param array $links
    *   Links.
    */
-  protected function initClasses(array $links) {
+  protected function initClasses(array $links = []) {
     foreach ($links as $item) {
       $id = $item['original_link']->getPluginId();
       $suffix = explode('.', $id);