IE下报错“Objects are not valid as a React child”

Question

错误描述：Objects are not valid as a React child. If you meant to render a collection of children, use an array instead or wrap the object using createFragment(object) from the React add-ons. Check the render method of Root.

我知道react child不能是一个对象，需转成数组或者字符串 ，但是我没在我的Root类里发现这样的错误，而且这个bug只在IE下出现，这个错误信息是指Root类本身有问题还是说Root类里所有可能渲染的组件有问题

import React, { Component, PropTypes } from 'react'

import { Provider } from 'react-redux'

import { Router, browserHistory } from 'react-router'

import { syncHistoryWithStore } from 'react-router-redux'

import routes from './routes'

export default class Root extends Component {

  render() {

    const { store } = this.props

    const history = syncHistoryWithStore(browserHistory, store)

        // render Root, and Router, which will load specific component when an URL is loaded

    return (

      <Provider store={store}>

        <div>

          <Router history={history} routes={routes} />

        </div>

      </Provider>

    )

  }

}```