react WillReceiveProps中state問題

class IssueRecordUpload extends React.Component {
    constructor(props) {
        super(props)
        this.state = {
          filters: {},
        }
        
    }
    static propTypes = {
        filters: PropTypes.object,
        dispatch: PropTypes.func
    }
    
      componentDidMount() {
        const {filters} = this.props
        this.setState({
          filters: filters
        }, () => {
          this.load()
        })
      }
      
      componentWillReceiveProps(next) {
        const {filters} = this.state   // filters = undefined
        if (filters.toString() !== next.filters.toString()) {
          this.setState({
            filters: next.filters,
          }, () => {
            this.load()
          })
        }
      }
      
       load = () => {
        const {dispatch} = this.props
        const {filters} = this.state
        dispatch(filters)
      }

}

filters和dispatch是父組件傳進(jìn)來的，DidMount的時(shí)候setState() props.filter -> state.filters，在WillReceiveProps中再接收新的props，發(fā)現(xiàn)原有state.filters為undefined，并且setState失敗，但是next.filters是存在的，求解是什么原因。謝謝大佬!