laravel 5.1 Auth::check() 500 internal server error afterJWTAuth::attempt($credentials) login

I am creating login api in laravel 5.1.

I have created user authentication in controller

    try {

        // verify the credentials and create a token for the user

        if (! $token = JWTAuth::attempt($credentials)) {
            $response['error'] = 'true';
            $response['data'] = 'invalid_credentials';
            return response()->json($response);
        }

    } catch (JWTException $e) {
        // something went wrong
        $response['error'] = 'true';
        $response['data'] = 'could_not_create_token';
        return response()->json($response);
    }

    $response['error'] = 'false';

    $response['data'] = ['token'=>$token];
    return response()->json($response);

It is working, and successfully generating token.

but in this code before return, if check login dd(Auth::check()); It throws

Status 500 Internal Server Error

Then here, How can I get user from database after successful login?

via Chebli Mohamed