Causing a crash on qt 5.8

AppCrash.qml

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    ListModel {
        id: testModel
        Component.onCompleted: {
            testModel.append(
                        {
                            "key" : "click me to test",
                            "nested" : { "anotherObjKey": "test" } // this line causes a crash
                        }

            );
        }
    }

    ColumnLayout {
        width: 100

        Repeater {
            model: testModel
            delegate: Rectangle {
                width: 200
                height: 50
                color: "#eee"
                Text {
                    anchors.centerIn: parent
                    text: testModel.get(index).key
                }
                MouseArea {
                    anchors.fill: parent
                    onClicked: {
                        testModel.remove(0);
                    }
                }
            }

        }
    }


}