Exception 'metajs.js:155 Uncaught TypeError: Cannot set property 'value' of undefined'

[slonm]

Following code:

function* foo(){
  var index = 0;
  while(index <= 2) // при достижении 2, done в yield станет true, а value undefined;
    yield index++;
}

var iterator = foo();
console.log(iterator.next()); // { value:0, done:false }
console.log(iterator.next()); // { value:1, done:false }
console.log(iterator.next()); // { value:2, done:false }
console.log(iterator.next()); // { value:undefined, done:true }

Led to exception 'metajs.js:155 Uncaught TypeError: Cannot set property 'value' of undefined' on row
'console.log(iterator.next()); // { value:1, done:false }'

Browser: Chrome 53.0.2785.116 (64-bit)