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.
{null}foo{null}
            {false}
          </div>,
        );
        expect(e.childNodes.length).toBe(1);
        expectTextNode(e.childNodes[0], 'foo');
      });
      itRenders('only null and false children as blank', async render => {
        const e = await render(
          <div>
            {false}
            {null}
            {null}
            {false}
          </div>,
        );
        expect(e.childNodes.length).toBe(0);
      });
    });
    describe('elements with implicit namespaces', function() {
      itRenders('an svg element', async render => {
        const e = await render(<svg />);
        expect(e.childNodes.length).toBe(0);
        expect(e.tagName).toBe('svg');
        expect(e.namespaceURI).toBe('http://www.w3.org/2000/svg');
      });
      itRenders('svg child element with an attribute', async render => {
        let e = await render(<svg viewBox="0 0 0 0" />);
        expect(e.childNodes.length).toBe(0);
        expect(e.tagName).toBe('svg');