Error in IE10

[haddoq]

There seems to be a problem with IE10 both on local machine and on https://react-universally.now.sh/
Shouldn't the site work in IE10 with babel-env "last 2 versions" and polyfill.io?
Got these errors in the devtools console:

Error walking your react tree
TypeError: Unable to get property 'asyncComponents' of undefined or null reference
{
[functions]: ,
__�symbol:__�symbol:react.element0.7163679959125997: undefined,
__�symbol:hasInstance0.71636799591259978: undefined,
__�symbol:isConcatSpreadable0.71636799591259979: undefined,
__�symbol:iterator0.71636799591259971: undefined,
__�symbol:match0.716367995912599710: undefined,
__�symbol:NaN0.71636799591259974: undefined,
__�symbol:NaN0.71636799591259976: undefined,
__�symbol:replace0.716367995912599711: undefined,
__�symbol:search0.716367995912599712: undefined,
__�symbol:species0.71636799591259972: undefined,
__�symbol:split0.716367995912599713: undefined,
__�symbol:toPrimitive0.716367995912599714: undefined,
__�symbol:toStringTag0.71636799591259977: undefined,
__�symbol:undef0.71636799591259973: undefined,
__�symbol:undef0.71636799591259975: undefined,
__�symbol:unscopables0.716367995912599715: undefined,
description: "Unable to get property 'asyncComponents' of undefined or null reference",
message: "Unable to get property 'asyncComponents' of undefined or null reference",
name: "TypeError",
number: -2146823281,
stack: "TypeError: Unable to get property 'asyncComponents' of undefined or null reference
at t (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:120829)
at Anonymous function (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:216661)
at s (https://cdn.polyfill.io/v2/polyfill.min.js?features=default,es6:3:14311)
at n.exports (https://cdn.polyfill.io/v2/polyfill.min.js?features=default,es6:3:16834)
at r (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:216028)
at p (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:216277)
at c (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:216486)
at Anonymous function (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:216780)
at s (https://cdn.polyfill.io/v2/polyfill.min.js?features=default,es6:3:14311)
at n.exports (https://cdn.polyfill.io/v2/polyfill.min.js?features=default,es6:3:16834)"
}

Uncaught (in promise) TypeError: Unable to get property 'asyncComponents' of undefined or null reference
at t (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:120829)
at _._constructComponentWithoutOwner (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:138355)
at _._constructComponent (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:138219)
at _.mountComponent (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:137406)
at mountComponent (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:13407)
at _.performInitialMount (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:139178)
at _.mountComponent (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:137982)
at mountComponent (https://react-universally.now.sh/client/index-aa82d9f216c877685074.js:1:13407)
at _.performInitialMount (https://react-universally.now.sh/client/index-aa82d9

[strues]

Try adding Symbol to the polyfill.io include.

[haddoq]

Symbol is included via the es6 set. I think the problem is that the rendering of the client happens before the polyfill.io is loaded and ready. Maybe we could load the polyfills with a callback that start the render. https://polyfill.io/v2/polyfill.min.js?callback=polyfillsAreLoaded