const players = queryString.parse(this.props.location.search);
api.battle([
  players.playerOneName,
  players.playerTwoName
]).then((players) => {
  if(players === null) {
    return this.setState(() => {
      return {
        error: 'Looks like there was an error. Check that both users exist',
        loading: false
      }
    });
  }
  this.setState(() => {
    return {
      error: null,
      winner: players[0],
      loser: players[1],
      loading: false
    }
  });
}.bind(this));  // <-- This causes an error in both my editor and webpack