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: mixed,
  context: Object,
): {|
  child: mixed,
  context: Object,
|} {
  let element: ReactElement;
  let Component;
  let publicContext;
  let inst, queue, replace;
  let updater;
  let initialState;
  let oldQueue, oldReplace;
  let nextState, dontMutate;
  let partial, partialState;
  let childContext;
  let childContextTypes, contextKey;
  while (React.isValidElement(child)) {
    
    element = ((child: any): ReactElement);
    if (__DEV__) {
      pushElementToDebugStack(element);
    }
    Component = element.type;
    if (typeof Component !== 'function') {