JSONifying ListModel.get crashes if the content is a list-containing object

import QtQuick 2.5
Item {
    visible: true
    width: 640
    height: 480
    ListModel {
        id : model
    }
    Component.onCompleted: {
        var tempData = {
            subItems: []
        }
        model.insert(0, tempData)
        JSON.stringify(model.get(0))
    }
}