🐞 fix(permissions): 修复无路由前缀时，内置的 RBAC 系统点击「新增权限」时报错的问题

src/Http/Controllers/PermissionController.php

@@ -146,7 +146,7 @@ class PermissionController extends AdminController
 
     public function getRoutes()
     {
-        $prefix = config('admin.route.prefix');
+        $prefix = (string) config('admin.route.prefix');
 
         $container = collect();