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.
) {
          
          expect(e.childNodes.length).toBe(5);
          expectTextNode(e.childNodes[0], 'a');
          expectTextNode(e.childNodes[2], 'b');
          expect(e.childNodes[3].childNodes.length).toBe(3);
          expectTextNode(e.childNodes[3].childNodes[0], 'c');
          expectTextNode(e.childNodes[3].childNodes[2], 'd');
          expectTextNode(e.childNodes[4], 'e');
        } else {
          expect(e.childNodes.length).toBe(4);
          expectTextNode(e.childNodes[0], 'a');
          expectTextNode(e.childNodes[1], 'b');
          expect(e.childNodes[2].childNodes.length).toBe(2);
          expectTextNode(e.childNodes[2].childNodes[0], 'c');
          expectTextNode(e.childNodes[2].childNodes[1], 'd');
          expectTextNode(e.childNodes[3], 'e');
        }
      });
    });
    describe('number children', function() {
      itRenders('a number as single child', async render => {
        const e = await render(<div>{3}</div>);
        expect(e.textContent).toBe('3');
      });
      
      itRenders('zero as single child', async render => {
        const e = await render(<div>{0}</div>);
        expect(e.textContent).toBe('0');
      });