自定义跳转500错误界面报错

 public function render(Request $request, Throwable $exception): Response
    {
        $code = $exception->getCode();
        //ajax请求返回json格式
        if ($request->expectsJson()) {
            return jsonResponse($code ? $code : 500, $exception->getMessage());
        }
        //页面请求返回500模板
        return view('500', ['exception' => $exception]);
    }