Runtime error when used custom popup based on QQuickPopup from Quick Controls 2

    TEMPLATE = app
    
    QT += gui qml quick quickcontrols2
    QT_PRIVATE += quick-private core-private gui-private qml-private quickcontrols2-private quicktemplates2-private
    
    CONFIG += c++11
    
    SOURCES += main.cpp \
        custompopup.cpp
    
    RESOURCES += qml.qrc
    
    # Additional import path used to resolve QML modules in Qt Creator's code model
    QML_IMPORT_PATH =
    
    # Default rules for deployment.
    include(deployment.pri)
    
    HEADERS += \
        custompopup.h

    #ifndef CUSTOMPOPUP_H
    #define CUSTOMPOPUP_H
    
    #include <private/qquickpopup_p.h>
    
    class CustomPopup : public QQuickPopup
    {
    
        Q_OBJECT
        //Q_PROPERTY(QQmlListProperty<QObject> contentData READ contentData FINAL)
        //Q_CLASSINFO("DefaultProperty", "contentData")
    public:
        CustomPopup(QObject *parent = nullptr);
    
    protected:
        bool overlayEvent(QQuickItem *item, QEvent *event) override;
    
    private:
        /*Q_DISABLE_COPY(CustomPopup)
        Q_DECLARE_PRIVATE(QQuickPopup)*/
    };
    
    
    QML_DECLARE_TYPE(CustomPopup)
    
    #endif // CUSTOMPOPUP_H

    #include "custompopup.h"
    
    CustomPopup::CustomPopup(QObject *parent) : QQuickPopup(parent)
    {
    
    }
    
    bool CustomPopup::overlayEvent(QQuickItem *item, QEvent *event)
    {
            /*QQuickPopup implementation
            Q_D(QQuickPopup);
            switch (event->type()) {
            case QEvent::KeyPress:
            case QEvent::KeyRelease:
            case QEvent::MouseMove:
            case QEvent::Wheel:
                if (d->modal)
                    event->accept();
                return d->modal;
    
            case QEvent::MouseButtonPress:
            case QEvent::MouseButtonRelease:
                if (d->modal)
                    event->accept();
                d->tryClose(item, static_cast<QMouseEvent *>(event));
                return d->modal;
    
            default:
                return false;
            }
            */
       // Q_D(QQuickPopup);
        return QQuickPopup::overlayEvent(item, event);
    }

    #include <QGuiApplication>
    #include <QQmlApplicationEngine>
    #include "custompopup.h"
    
    int main(int argc, char *argv[])
    {
        QGuiApplication app(argc, argv);
    
        QQmlApplicationEngine engine;
    
        qmlRegisterType<CustomPopup>("Custom", 1, 0, "CPopup");
    
        engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    
        return app.exec();
    }

    import QtQuick 2.7
    import QtQuick.Controls 1.5
    
    ApplicationWindow {
        visible: true
        width: 600
        height: 480
    
        MyItem {
            anchors.fill: parent
        }
    }

    import QtQuick 2.0
    import QtQuick.Controls 2.0
    import Custom 1.0
    
    Item {
    
        MouseArea {
            anchors.fill: parent
            acceptedButtons: Qt.RightButton
            onClicked: {
                menu.x = mouse.x
                menu.y = mouse.y
                menu.open()
            }
    
        }
    
        CPopup {
            id: menu
            Rectangle {
                width: 100
                height: 100
                color: "red"
            }
        }
    }