Sequelize: TypeError: Cannot read property 'through' of null

index.js

var Sequelize = require('sequelize');
var Promise = require('bluebird');

var sequelize = new Sequelize('test', 'pmougel', '', {
  logging: false,
  dialect: 'postgres',
  omitNull: true
});

var User = sequelize.define(
  'users',
  {
    id: {
      type: Sequelize.INTEGER,
      autoIncrement: true,
      primaryKey: true
    },
    email: {
      type: Sequelize.STRING,
      allowNull: false
    }
  },
  { timestamps: false }
);

var Image = sequelize.define(
  'images',
  {
    id: {
      type: Sequelize.INTEGER,
      autoIncrement: true,
      primaryKey: true
    },
  },
  { timestamps: false }
);

var ReferenceData = sequelize.define(
  'referencedata',
  {
    id: {
      type: Sequelize.INTEGER,
      autoIncrement: true,
      primaryKey: true
    },
    type: {
      type: Sequelize.STRING,
      allowNull: false
    }
  }, { timestamps: false }
);

Image.hasMany(ReferenceData, {through: ReferenceData, onDelete: 'cascade'});
User.hasMany(ReferenceData, {through: ReferenceData, onDelete: 'cascade'});
ReferenceData.belongsTo(Image);
ReferenceData.belongsTo(User);

sequelize.sync({force: true})
.then(function () {
  return Promise.all([
    Image.create(),
    User.create({email: '[email protected]'})
  ])
})
.spread(function (image, user) {
  image.getReferencedata()
})
.catch(console.log.bind(console))

package.json

{
  "name": "sequelizetest",
  "version": "0.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "BSD-2-Clause",
  "dependencies": {
    "sequelize": "~2.0.0-dev11",
    "pg": "~3.2.0",
    "bluebird": "~1.2.4"
  }
}