Cannot convert undefined or null to object. What could be the problem?

Question

JavaScript

I can not understand why when I display the object it throws an error?
The object itself is definitely not empty. Through the console you can see that there is an object

class ShowList extends Component {

  render() {
    const showList = () => Object.values(this.props.articles).map(i => {
      return (
        <li key={i.id} className="app__list__showList">
        </li>
      )
    })
    return (
      <ul className="app__list__showList">
        {showList()}
        {/* {console.log(this.props.articles)} */}
      </ul>
    );
  }
}

const mapStateToProps = state => {
  const data = state.fetchReducer;
  return {
    articles: data.data
  }
}

export default connect(mapStateToProps)(ShowList);

Answer 1

Most likely an error in the reducer. Pass the null or undefined operator to spread.
{ ...someValue }