This might be a reference to this one: https://github.com/facebook/react/issues/10212#issuecomment-346302374

The problem still exist.

So, trying to render with server side and got this error. I don't have this notation in my code but this might be a problem with dependencies.

```
TypeError: Cannot read property 'toLowerCase' of undefined
    at ReactDOMServerRenderer.renderDOM (/Users/lukasborawski/Dev/web-client/node_modules/react-dom/cjs/react-dom-server.node.development.js:2304:27)
...
```

```
"react": "^16.1.1",
"react-dom": "^16.2.0",
```

Thx for help.
warning(
          tag === element.type,
          '<%s /> is using uppercase HTML. Always use lowercase HTML tags ' +
            'in React.',
          element.type,
        );
      }
    }
    validateDangerousTag(tag);
    let props = element.props;
    if (tag === 'input') {
      if (__DEV__) {
        ReactControlledValuePropTypes.checkPropTypes(
          'input',
          props,
          getStackAddendum,
        );
        if (
          props.checked !== undefined &&
          props.defaultChecked !== undefined &&
          !didWarnDefaultChecked
        ) {
          warning(
            false,
            '%s contains an input of type %s with both checked and defaultChecked props. ' +
              'Input elements must be either controlled or uncontrolled ' +
              '(specify either the checked prop, or the defaultChecked prop, but not ' +
              'both). Decide between using a controlled or uncontrolled input ' +
              'element and remove one of these props. More info: ' +
              'https://fb.me/react-controlled-components',