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.
if (initialValue == null) {
        let defaultValue = props.defaultValue;
        
        let textareaChildren = props.children;
        if (textareaChildren != null) {
          if (__DEV__) {
            warning(
              false,
              'Use the `defaultValue` or `value` props instead of setting ' +
                'children on <textarea>.',
            );
          }
          invariant(
            defaultValue == null,
            'If you supply `defaultValue` on a <textarea>, do not pass children.',
          );
          if (Array.isArray(textareaChildren)) {
            invariant(
              textareaChildren.length <= 1,
              '<textarea> can only have at most one child.',
            );
            textareaChildren = textareaChildren[0];
          }
          defaultValue = '' + textareaChildren;
        }
        if (defaultValue == null) {
          defaultValue = '';
        }
        initialValue = defaultValue;
      }