I am stuck with an ugly issue which I am unable to resolve. I am beginner in React.

This is my Code

```
handleCheckChildElement(event) {
    let items = this.state.items;
    items.forEach(items = () => {
        if(items.value === event.target.value) {
            items.isChecked = event.target.checked;
        }
    });
    this.setState({ items });
}

```

This is the image of the error - [![Error Image](https://i.stack.imgur.com/luVfE.png)](https://i.stack.imgur.com/luVfE.png)