qml crash after close

main.py

import sys
from PyQt5.QtCore import QUrl
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine


def run():
    app = QGuiApplication(sys.argv)

    engine = QQmlApplicationEngine()
    engine.load(QUrl('main.qml'))

    if not engine.rootObjects():
        return -1

    return app.exec_()


if __name__ == '__main__':
    sys.exit(run())

main.qml

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3
import QtQuick.Dialogs 1.2

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

    FileDialog {
        id: fileDialog
        selectFolder: true

        onAccepted: {
            console.log('activated')
        }
    }

    Button {
        anchors.centerIn: parent
        text: "Open"
        onClicked: {
            fileDialog.open()
        }
    }
}