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.
child = e.childNodes[1];
          textNode2 = e.childNodes[2];
          expect(e.id).toBe('parent');
          expectTextNode(textNode1, '  ');
          expect(child.id).toBe('child');
          expect(child.childNodes.length).toBe(0);
          expectTextNode(textNode2, '   ');
        },
      );
      itRenders('a composite with multiple children', async render => {
        const Component = props => props.children;
        const e = await render(
          <Component>{['a', 'b', [undefined], [[false, 'c']]]}</Component>,
        );
        let parent = e.parentNode;
        if (
          render === serverRender ||
          render === clientRenderOnServerString ||
          render === streamRender
        ) {
          
          
          expect(parent.childNodes.length).toBe(5);
          expectTextNode(parent.childNodes[0], 'a');
          expectTextNode(parent.childNodes[2], 'b');
          expectTextNode(parent.childNodes[4], 'c');
        } else {
          expect(parent.childNodes.length).toBe(3);
          expectTextNode(parent.childNodes[0], 'a');
          expectTextNode(parent.childNodes[1], 'b');