Trying to reproduce NRE with ValidateActionParametersAttribute

PeopleController.cs

using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc;
using System.Linq;

namespace WebApplication.Controllers
{
    public class Person
    {
        public string Name { get; set; }
    }

    [RouteAttribute("[controller]")]
    public class PeopleController : Controller
    {
        [HttpPost]
        [ValidateActionParameters]
        public IActionResult Post([FromBody][Required]Person person)
        {
            if(!ModelState.IsValid)
            {
                return StatusCode(400, ModelState.First().Value);
            }

            if(person != null)
                return Ok(person.Name);
            else
                return Ok("person was null");
        }
    }
}