Missing primary key value after create

[goodman3]

Version:

package:
  "dependencies": {
    "bluebird": "^3.5.1",
    "mysql": "^2.15.0",
    "orm": "^4.0.2",
    "orm-transaction": "0.0.2",
    "request": "^2.83.0",
    "validator": "^8.2.0"
  }

node -v:
v6.10.2

db driver: 
ORM.connectAsync({
                host: obj.host,
                user: obj.user,
                password: obj.password,
                database: obj.databaseName,
                protocol: 'mysql',
                port: obj.port,
                query: {
                    debug: isDebug,
                    // timezone : 'GMT+8'
                }
            })

Model:

const user = require('../user');
const schedule = db.define('schedule', {
    id: {type: 'serial', key: true},
    title: {type: 'text', size: 128, key: true},
    text: {type: 'text', size: 512},
    is_todo_list: {type: 'boolean', index: true,defaultValue:false},   
    type: {type: 'enum', values: ['SELF', 'BROADCAST', 'OTHER'], index: true, required: true},
    created_at: {type: 'date', time: true, index: true}, 
    start_at: {type: 'date', time: true, index: true}, 
    end_at: {type: 'date', time: true, index: true},  
}, {
    hooks: {
        afterAutoFetch: function () {
            this.created_at = new Date(this.created_at).getTime();
            this.start_at = new Date(this.start_at).getTime();
            this.end_at = new Date(this.end_at).getTime();
        },
        beforeValidation: function () {
            this.created_at = new Date(this.created_at);
            this.start_at = new Date(this.start_at);
            this.end_at = new Date(this.end_at);
        }
    }
});
schedule.hasMany('receiver', user);

Create:

            console.log('obj :',obj);
            schedule.create(obj, (e, r) => {
                console.log('e,r :',e,JSON.stringify(r));
                if (e) {
                    reject(e);
                } else {
                    resolve(r);
                }
            });

And console log shows:

obj : { title: 'title',
  text: 'text',
  is_todo_list: true,
  type: 'OTHER',
  start_at: 1517917402000,
  end_at: 1517967402000,
  receiver: [ 2, 3 ] }
[SQL/mysql] INSERT INTO `schedule` (`title`, `text`, `is_todo_list`, `type`, `start_at`, `end_at`, `created_at`, `author_id`) VALUES ('title', 'text', 1, 'OTHER', '2018-02-06 19:43:22.000', '2018-02-07 09:36:42.000', '1970-01-01 08:00:00.000', NULL)
[SQL/mysql] SELECT `t1`.`id`, `t1`.`name`, `t1`.`level`, `t1`.`master_id` FROM `department` `t1` JOIN `user_department` `t2` ON `t2`.`department_id` = `t1`.`id` WHERE `t2`.`user_id` = 2
[SQL/mysql] SELECT `t1`.`id`, `t1`.`name`, `t1`.`level`, `t1`.`master_id` FROM `department` `t1` JOIN `user_department` `t2` ON `t2`.`department_id` = `t1`.`id` WHERE `t2`.`user_id` = 3
[SQL/mysql] DELETE FROM `schedule_receiver` WHERE `schedule_id` IS NULL AND `undefined` = 'title'
e,r : { Error: ER_BAD_FIELD_ERROR: Unknown column 'undefined' in 'where clause'
    at Query.Sequence._packetToError (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\sequences\Sequence.js:52:14)
    at Query.ErrorPacket (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\sequences\Query.js:77:18)
    at Protocol._parsePacket (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\Protocol.js:279:23)
    at Parser.write (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\Parser.js:76:12)
    at Protocol.write (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (D:\projects\xxxxxxx\node_modules\mysql\lib\Connection.js:103:28)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at TCP.onread (net.js:551:20)
    --------------------
    at Protocol._enqueue (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\Protocol.js:145:48)
    at Connection.query (D:\projects\xxxxxxx\node_modules\mysql\lib\Connection.js:208:25)
    at Driver.execSimpleQuery (D:\projects\xxxxxxx\node_modules\orm\lib\Drivers\DML\mysql.js:103:13)
    at Driver.remove (D:\projects\xxxxxxx\node_modules\orm\lib\Drivers\DML\mysql.js:216:8)
    at run (D:\projects\xxxxxxx\node_modules\orm\lib\Associations\Many.js:339:25)
    at Object.value (D:\projects\xxxxxxx\node_modules\orm\lib\Associations\Many.js:352:9)
    at Object.value (D:\projects\xxxxxxx\node_modules\orm\lib\Associations\Many.js:298:40)
    at saveAssociation (D:\projects\xxxxxxx\node_modules\orm\lib\Instance.js:279:25)
    at _saveManyAssociation (D:\projects\xxxxxxx\node_modules\orm\lib\Instance.js:332:7)
    at saveAssociations (D:\projects\xxxxxxx\node_modules\orm\lib\Instance.js:336:7)
    at D:\projects\xxxxxxx\node_modules\orm\lib\Instance.js:218:14
    at Query._callback (D:\projects\xxxxxxx\node_modules\orm\lib\Drivers\DML\mysql.js:196:12)
    at Query.Sequence.end (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\sequences\Sequence.js:88:24)
    at Query._handleFinalResultPacket (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\sequences\Query.js:139:8)
    at Query.OkPacket (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\sequences\Query.js:72:10)
    at Protocol._parsePacket (D:\projects\xxxxxxx\node_modules\mysql\lib\protocol\Protocol.js:279:23)
  code: 'ER_BAD_FIELD_ERROR',
  errno: 1054,
  sqlMessage: 'Unknown column \'undefined\' in \'where clause\'',
  sqlState: '42S22',
  index: 0,
  sql: 'DELETE FROM `schedule_receiver` WHERE `schedule_id` IS NULL AND `undefined` = \'title\'',
  instance: 
   { id: [Getter/Setter],
     title: [Getter/Setter],
     text: [Getter/Setter],
     is_todo_list: [Getter/Setter],
     type: [Getter/Setter],
     created_at: [Getter/Setter],
     start_at: [Getter/Setter],
     end_at: [Getter/Setter],
     author_id: [Getter/Setter],
     receiver: [Getter/Setter] } } undefined

If I remove hasMany object 'receiver: [ 2, 3 ]', the result will be:

obj : { title: 'title',
  text: 'text',
  is_todo_list: true,
  type: 'OTHER',
  start_at: 1517917402000,
  end_at: 1517967402000 }
[SQL/mysql] INSERT INTO `schedule` (`title`, `text`, `is_todo_list`, `type`, `start_at`, `end_at`, `created_at`, `author_id`) VALUES ('title', 'text', 1, 'OTHER', '2018-02-06 19:43:22.000', '2018-02-07 09:36:42.000', '1970-01-01 08:00:00.000', NULL)
e,r : null {"title":"title","text":"text","is_todo_list":true,"type":"OTHER","created_at":"1970-01-01T00:00:00.000Z","start_at":"2018-02-06T11:43:22.000Z","end_at":"2018-02-07T01:36:42.000Z","author_id":null}

You can see after create, id is missing. I can't understand why because my other models are more complicated but they don't have this issue.