Mongoose: RangeError: jsonwebtoken을 URL에 추가한 후 데이터베이스에 데이터를 업데이트하는 동안 최대 호출 스택 크기가 초과되었습니다.

내 앱(메신저 앱에서 새 메시지를 입력하면 메시지(문자열) 입력 후 제출을 클릭하면 노드 서버가 닫히고 아래와 같은 오류가 발생합니다.
입력 양식으로 제출하는 새 메시지는 데이터베이스에 저장되지만. 그리고 노드 서버를 다시 시작하면 나타납니다.

/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongodb/lib/utils.js:132
      throw err;
      ^

RangeError: Maximum call stack size exceeded
    at model.Document.$toObject (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/document.js:2058:40)
    at model.Document.toJSON (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/document.js:2401:15)
    at clone (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:164:18)
    at cloneObject (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:246:11)
    at clone (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:172:16)
    at model.Document.$toObject (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/document.js:2109:13)
    at model.Document.toJSON (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/document.js:2401:15)
    at clone (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:164:18)
    at cloneArray (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:260:14)
    at clone (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:159:12)
    at cloneObject (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:246:11)
    at clone (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:172:16)
    at model.Document.$toObject (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/document.js:2109:13)
    at model.Document.toJSON (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/document.js:2401:15)
    at clone (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:164:18)
    at cloneObject (/home/paul/codes/ng2/Seed-MEAN-Feb18-WIP/node_modules/mongoose/lib/utils.js:246:11)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/paul/.npm/_logs/2018-03-07T12_32_54_826Z-debug.log

내 ../models/messages.js의 내용

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var User = require('./user');

var schema = new Schema({
    content: {type: String, required: true},
    user: {type: Schema.Types.ObjectId, ref: 'User'}
});

schema.post('remove', function (message) {
    User.findById(message.user, function (err, user) {
        user.messages.pull(message);
        user.save();
    });
});

module.exports = mongoose.model('Message', schema);

이 문제는 post URL에 토큰을 추가하기 위해 ./message/message.service.ts 파일에 jsonwebtoken에 대한 코드를 삽입한 후 발생하기 시작했습니다.

addMessage(message: Message) {
        const body = JSON.stringify(message);
        const headers = new Headers({'Content-Type': 'application/json'});
        const token = localStorage.getItem('token')
            ? '?token=' + localStorage.getItem('token')
            : '';
        return this.http.post('http://localhost:3000/message' + token, body, {headers: headers})
            .map((response: Response) => {
                const result = response.json();
                const message = new Message(
                    result.obj.content,
                    result.obj.user.firstName,
                    result.obj._id,
                    result.obj.user._id);
                this.messages.push(message);
                return message;
            })
            .catch((error: Response) => Observable.throw(error.json()));
    }

프로젝트의 전체 소스 코드 - 전체 코드 기반

node.js, mongoose 및 MongoDB 버전을 언급하십시오.
노드 - v9.3.0
mongodb - 버전 v3.6.3
몽구스 - 5.0.9