Core polyfill bug (unable to get property of undefined or null reference)

[niftylettuce]

When using IE10 with this URL, the following error occurs:

<script src="https://polyfill.io/v3/polyfill.min.js?features=es6,Map,Map.prototype,Math.sign,Promise,Reflect,Symbol,Symbol.iterator,Symbol.prototype,Symbol.toPrimitive,Symbol.toStringTag,Uint32Array,window.crypto"></script>

https://polyfill.io/v3/polyfill.min.js?features=es6,Map,Map.prototype,Math.sign,Promise,Reflect,Symbol,Symbol.iterator,Symbol.prototype,Symbol.toPrimitive,Symbol.toStringTag,Uint32Array,window.crypto&ua=ie/10

Possibly related to polyfillpolyfill/polyfill-service#145

[niftylettuce]

Related to #218, also happens in IE11.

[JakeChampion]

This looks to be fixed, I tested the polyfill.io script tag on ie 10 and no errors were thrown