ReferenceError: document is not defined

When rendering on server side it gives:

```
ReferenceError: document is not defined

ariaAppHider.js:5 Object.setElement
[frontend]/[react-responsive-ui]/node_modules/react-modal/lib/helpers/ariaAppHider.js
```

Is fixed by https://github.com/reactjs/react-modal/pull/273