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.
'As a temporary workaround, you can rename to ' +
                  'UNSAFE_componentWillMount instead.',
                componentName,
              );
              didWarnAboutDeprecatedWillMount[componentName] = true;
            }
          }
        }
        
        
        if (typeof Component.getDerivedStateFromProps !== 'function') {
          inst.componentWillMount();
        }
      }
      if (
        typeof inst.UNSAFE_componentWillMount === 'function' &&
        typeof Component.getDerivedStateFromProps !== 'function'
      ) {
        
        
        inst.UNSAFE_componentWillMount();
      }
      if (queue.length) {
        oldQueue = queue;
        oldReplace = replace;
        queue = null;
        replace = false;
        if (oldReplace && oldQueue.length === 1) {
          inst.state = oldQueue[0];
        } else {