ListView asserts when a null model is assigned from a QObject derivative typed property.

The snippet below will assert in QQmlAdaptorModel::setModel because it assumes a QVariant of a QObject derived type cannot be null.

Changing the type of the model property from ListModel prevents the crash.

Item {
    id: root

    width: 100
    height: 100

    property ListModel model

    ListView {
        model: root.model
    }
}