可以獲取 model 並並且可以 dd (),但是 return 時為 null,且不能呼叫方法

如題, 確認$role是獲取成功的,可以列印出具體資料,但是會觸發throw Error, return的值是null.
有人遇到過類似問題嗎,求解

    public static function findByName(string $name,  $site_id = null, $guardName = null): RoleContract
    {
        $guardName = $guardName ?? Guard::getDefaultName(static::class);
        if (is_null($site_id))
        $site_id = self::getUser()->site_id ?? 0;
        $role = static::where('name', $name)->where('guard_name', $guardName)
            ->where('site_id', $site_id)->first();
        if (! $role) {
            throw RoleDoesNotExist::named($name);
        }

        return $role;
    }

Role {#689
  +guarded: array:1 [
    0 => "id"
  ]
  #connection: "mysql"
  #table: "roles"
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  #perPage: 15
  +exists: true
  +wasRecentlyCreated: false
  #attributes: array:7 [
    "id" => 608
    "site_id" => 270
    "name" => "Editor"
    "guard_name" => "web"
    "created_at" => "2019-06-18 11:04:54"
    "updated_at" => "2019-06-18 11:04:54"
    "remarks" => "編輯"
  ]
  #original: array:7 [
    "id" => 608
    "site_id" => 270
    "name" => "Editor"
    "guard_name" => "web"
    "created_at" => "2019-06-18 11:04:54"
    "updated_at" => "2019-06-18 11:04:54"
    "remarks" => "編輯"
  ]
  #changes: []
  #casts: []
  #dates: []
  #dateFormat: null
  #appends: []
  #dispatchesEvents: []
  #observables: []
  #relations: []
  #touches: []
  +timestamps: true
  #hidden: []
  #visible: []
  #fillable: []
  -permissionClass: null
}