>
{
(props.it.items || [])
- .map((item: any) => <div key={item.id} data-id={item.id}
+ .map((item: any, index: number) => <div key={item.id || index} data-id={item.id}
className={classnames(props.classes.childItem, { [props.classes.active]: item.active })}
style={{ paddingLeft: `${item.depth * props.levelIndentation}px` }}>
{isInFavoritesTree(props.it) ?