ErrorException: Attempt to read property "roleName" on null in file

ErrorException: Attempt to read property "roleName" on null in file

C:\xampp\htdocs\eraasoftBackendWorkshop\app\Http\Middleware\Roles.php on line 24

i make rout when i login as admin and send token in postman it work without problem but if login as support or secretary and and send token and try make update or anything show me this error

and this my middleware

namespace App\Http\Middleware;

use App\Http\Traits\ApiDesignTrait;

use Closure;

use Illuminate\Http\Request;

use ApiResponse;

class Roles { use ApiDesignTrait;

/**

 * Handle an incoming request.
 *
 * @param  \Illuminate\Http\Request  $request

 * @param  \Closure  $next

 * @return mixed

/* */

public function handle(Request $request, Closure $next, $roles)
{
    $userRole = auth()->user()->roleName->name;


    $allowUser = explode ('.',$roles);

    if(!in_array($userRole , $allowUser)){

        return $this->ApiResponse(422,' OOPS Not Allow for you not your Job');
    }
    return $next($request);
}

}