QML MouseArea::onDoubleClicked works occasionally

Item {
    id: lItem
    visible: true
    signal sendDoubClick(int index)
    ...
    ListView {
        id: lView
        model: someModel
        anchors.fill: parent
        ...
        delegate: Rectangle {
            id: listItem
            width: lView.width
            height: 200
            function select(){ some selection code }
            ...
            MouseArea {
                id: tapArea
                z: -1
                anchors.fill: parent
                onDoubleClicked: lItem.sendDoubClick( index )
                onClicked: listItem.select()
            }
        }
    }
}