qml listview with c++ nest listmodel crash when pop from stackview

[liweian]

i have a c++ nest listmodel structure like this

class ListModel : public AbstractListModel
{
public:
.....
private:
QList<QObject*> m_List;
}

class TrendListModel : public ListModel
{
public:
.....
void addTrendData(.....)
{
TrendData* trendData = new TrendData(....);

    QQmlEngine::setObjectOwnership(trendData, QQmlEngine::CppOwnership);

    beginInsertRows(QModelIndex(), rowCount(), rowCount());
    m_List << trendData;
    endInsertRows();
}

void addImage(int row, QString path)
{
    if(row < 0 || row >= rowCount())
    {
        qWarning() << "addImage to invalid trendData pointer!"
        return;
    }
    TrendData* trendData = qobject_cast<TrendData*>(m_List.at(row));
    trendData->addImage(...., path);

    emit dataChanged(index(row), index(row));
}

}

class TrendData : public QObject
{
public:
.....
{
m_ImageListModel = new ImageListModel(this);
QQmlEngine::setObjectOwnership(m_ImageListModel, QQmlEngine::CppOwnership);
}
void addImage(..., path)
{
m_ImageListModel->addImage(..., path);
}
private:
ImageListModel* m_ImageListModel;
}

class ImageListModel : public ListModel
{
void addImage(..., path)
{
Image* image = new Image(path, this);

     QQmlEngine::setObjectOwnership(image, QQmlEngine::CppOwnership);
     beginInsertRows(QModelIndex(), rowCount(), rowCount());
     m_List << image;
     endInsertRows();
 }

}

ListView{
model: trendListModel //from setContextProperty()

delegate{
    .......
    ListView{
        model: imageListModel //return from trendListModel's data function
    }
}

}

i append the instance of TrendListModel to qml listview, preview correctly, but when i pop the qml page from stackview, it crash on ios, but works fine on android. Attact crash report as below:

[qyvlik]

@liweian

Order code follow:

cpp:

//~ ListModel
AbstractListModel {
    QList<QObject*> m_List;
}

//~ TrendData
QObject{

    ImageListModel* m_ImageListModel;
    function addImage(..., path){
        m_ImageListModel->addImage(..., path);
    }
}

//~ TrendListModel
ListModel {
    function addTrendData(){
        var trendData = new TrendData();
        begineInsertRows();
        this->m_list << trendData;
        endInsertRows();
    }
    function addImage(row, path){
        if(something is not ok) return;
        
        var trendData = m_list.at(row);
        // here check trendData vaild.
        // if qobject_cast fail.
        //! [0]
        if(trendData == null) return;
        //! [0]
        trendData->addImage(..., path);
        emit dataChanged(index(row), index(row));
    }
}

class Image;

//~ ImageListModel
ListModel {
    function addImage(..., path){
        var image = new Image;
        beginInserRows();
        this->m_list << image;
        endInsertRows();
    }
}

qml:

ListView {
    model: trendListModel // from setContextProperty()
    delegate: ListView {
        model: imageListModel //return from trendListModel's data function
    }
}