A Qml warning is displayed in log when adding a Qml Item to a ListModel

#include <QGuiApplication>
#include <QQmlComponent>
#include <QQmlEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QQmlEngine engine;
    QQmlComponent component(&engine);    
    component.setData(
            R"(import QtQuick 2.15
            Item {
                width: 640
                height: 480
                ListModel {
                    id : model
                }
                Item {
                    id: a
                }
                Component.onCompleted: {
                     model.insert(0, a)
                }
            })",
            QUrl());    

  QScopedPointer<QObject>(component.create());    
  return app.exec();
}