diff --git a/admin_toolbar_links_access_filter/admin_toolbar_links_access_filter.module b/admin_toolbar_links_access_filter/admin_toolbar_links_access_filter.module
index bb8b1ae..daa1202 100755
--- a/admin_toolbar_links_access_filter/admin_toolbar_links_access_filter.module
+++ b/admin_toolbar_links_access_filter/admin_toolbar_links_access_filter.module
@@ -179,5 +179,5 @@ function admin_toolbar_links_access_filter_user_has_admin_role(AccountInterface
       $user_has_admin_role[$uid] = FALSE;
     }
   }
-  return $user_has_admin_role[$uid];
+  return $user_has_admin_role[$uid] ?? FALSE;
 }