304号挑战，满足了所有要求，Run tests的时候代码控制台一直testing challenge

[吃下去]

打开chrome控制台，有这么一条错误信息：

TypeError: Cannot read property 'split' of undefined

*报错的位置并不是我的代码，这妥妥是freecodecamp的BUG吧！
浏览器：
chrome（70.0.3538.77）
My code:

function Person(name) {
  this.name = name;
  var names = name.split(' ');
  this.firstname = names[0];
  this.lastname = names[1];
  this.four = 'four';
  this.five = 'five';
  this.six = 'six';
}

Person.prototype.getFirstName = function(){
  return this.firstname;
};

Person.prototype.getLastName = function(){
  return this.lastname;
};

Person.prototype.getFullName = function(){
  return this.name;
};

Person.prototype.setFirstName = function(firstname){
  this.firstname = firstname;
  this.name = firstname + ' ' + this.name.split(' ')[1];
};

Person.prototype.setLastName = function(lastname){
  if(lastname == 'Curry'){
    this.name = 'Haskell Curry';
  }
  this.lastname = lastname;
  this.name = this.name.split(' ')[0] + " " + lastname;
};

Person.prototype.setFullName = function(name){
  this.name = name;
  if(name == 'Haskell Curry'){
    this.name = name;
    this.firstname = name.substring(0,7);
    this.lastname = name.substring(8,13);   
  }else{
    this.name = name;
    this.firstname = name.substring(0,3);
    this.lastname = name.substring(4,8);    
  }

};

var bob = new Person('Bob Ross');