Warning: Each child in an array or iterator should have a unique "key" prop

Hey
I got my render here and each child get it's key prop but the below warning shows up on `tbody`.
Am I missing something?
Thanks!

```
render() {
const { health, platforms } = this.props;
const options = {
expandRowBgColor: 'rgb(242, 255, 163)'
};
return (

{[
,

Feature
,
...platforms.map(platform => {
const { device, os, osVersion, browser, browserVersion } = platform;
const key = JSON.stringify(platform);
return (

{`${device === 'desktop' ? '' : device} ${os} ${osVersion}`}
{' '}
{`${browser || ''} ${browserVersion || ''}`}

);
})
]}

);
}
```

```
Warning: Each child in an array or iterator should have a unique "key" prop. See https://fb.me/react-warning-keys for more information.
in tbody (created by TableBody)
in table (created by TableBody)
in div (created by TableBody)
in TableBody (created by BootstrapTable)
in div (created by BootstrapTable)
in div (created by BootstrapTable)
in BootstrapTable (at Health.js:41)
in _default (created by Connect(_default))
in Connect(_default) (created by Route)
in Route (at App.js:186)
in Router (at App.js:182)
in div (at App.js:181)
in section (at App.js:145)
in div (at App.js:57)
in App (created by Connect(App))
in Connect(App) (created by Route)
in Route (at index.js:13)
in Router (at index.js:12)
in Provider (at index.js:11)
```