tree does not render nodes

hello, im using the basic example on my Nextjs project
only thing i added is NoSsr component to prevent server side rendering (otherwise it fails)

```jsx
import React from "react";
import Typography from "@material-ui/core/Typography";
import NoSsr from '@material-ui/core/NoSsr';
import SortableTree from 'react-sortable-tree';

export default class MapComponent extends React.Component {
constructor(props) {
super(props);

this.state = {
treeData: [{ id: '1', title: 'Chicken', children: [{ id: '1.1', title: 'Egg' }] }],
};
}

render() {
return (

```

in browser, i can see that it renders:

- DragDropContext
--- ReactSortableTree
---- Scrolling
----- List
------ Grid

it pass the treeDada props all the way down but the tree nodes doesn't getting rendered
any ideas?