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.
propName,
              '', 
            );
          }
        }
        if (
          props.value !== undefined &&
          props.defaultValue !== undefined &&
          !didWarnDefaultSelectValue
        ) {
          warning(
            false,
            'Select elements must be either controlled or uncontrolled ' +
              '(specify either the value prop, or the defaultValue prop, but not ' +
              'both). Decide between using a controlled or uncontrolled select ' +
              'element and remove one of these props. More info: ' +
              'https://fb.me/react-controlled-components',
          );
          didWarnDefaultSelectValue = true;
        }
      }
      this.currentSelectValue =
        props.value != null ? props.value : props.defaultValue;
      props = Object.assign({}, props, {
        value: undefined,
      });
    } else if (tag === 'option') {
      let selected = null;
      const selectValue = this.currentSelectValue;
      const optionChildren = flattenOptionChildren(props.children);