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.
});
      itRenders(
        'a div with multiple children separated by whitespace',
        async render => {
          const e = await render(
            <div id="parent">
              <div id="child1" /> <div id="child2" />
            </div>,
          );
          expect(e.id).toBe('parent');
          let child1, child2, textNode;
          expect(e.childNodes.length).toBe(3);
          child1 = e.childNodes[0];
          textNode = e.childNodes[1];
          child2 = e.childNodes[2];
          expect(child1.id).toBe('child1');
          expect(child1.childNodes.length).toBe(0);
          expectTextNode(textNode, ' ');
          expect(child2.id).toBe('child2');
          expect(child2.childNodes.length).toBe(0);
        },
      );
      itRenders(
        'a div with a single child surrounded by whitespace',
        async render => {
          
          const e = await render(<div id="parent">  <div id="child" />   </div>); 
          let textNode1, child, textNode2;
          expect(e.childNodes.length).toBe(3);
          textNode1 = e.childNodes[0];