Problem in Parsing Arabic Characters

[farfary]

Hi i have a problem when using Alamofire with AlamofireObjectMaper for geting Array of my Category Object

my object :

import Foundation
import ObjectMapper

class Category: Mappable {

    public var iDCategory: Int?
    public var nameCategory: String?
    public var img: String?

    func mapping(map: Map) {
        iDCategory <- map["IDCategory"]
        nameCategory <- map["NameCategory"]
        img <- map["img"]
    }

    required init?(map: Map) {
     
    }

}

and my call :

import Foundation
import UIKit
import Alamofire

class ControllerSearch: UIViewController {

    override func viewDidLoad() {

        Alamofire.request("http://pazirandegan.farhadarghavan.ir/api/ApiCategory")
            .responseArray { (response: DataResponse<[Category]>) in
                for a in response.value!{
                    print(a.nameCategory!)
                }

        }

    }
}

JsonArray:

[{"IDCategory":2,"NameCategory":"رستوران و کافه","img":"/Upload/Images/eb0c3cd1-d911-43bb-bf59-9b736a98c49e.PNG"},{"IDCategory":3,"NameCategory":"پوشاک و البسه","img":"/Upload/Images/5da2b69a-3063-4b34-a74b-64ba8fb166c6.jpg"},{"IDCategory":4,"NameCategory":"پزشکی و سلامت","img":"/Upload/Images/a8bb9506-7c31-4ed0-b05b-41d9a760ab43.jpg"},{"IDCategory":5,"NameCategory":"فروشگاه و زنجیره ای","img":null},{"IDCategory":6,"NameCategory":"لوازم خانگی","img":null},{"IDCategory":7,"NameCategory":"زیبایی","img":null},{"IDCategory":8,"NameCategory":"فرهنگ و هنر","img":"/Upload/Images/43958739-0f41-489f-882c-65c2e2fd6eb1.jpg"},{"IDCategory":9,"NameCategory":"خودرو","img":null},{"IDCategory":10,"NameCategory":"کالای دیجیتال","img":null}]

i attached breakpoint in debuger and i have this error "fatal error: unexpectedly found nil while unwrapping an Optional value (lldb) "
when i call Alamofire responseString every things is ok

i asked question in stackoverflow
https://stackoverflow.com/questions/45884616/crash-when-calling-responsearray-get-method-with-alamofire-alamofireobjectma