Dynamically changing the Items in a ColumnLayout while resizing leads to crash

import QtQuick
import QtQuick.Layouts 1.15

Window {
    id: root
    visible: true
    ColumnLayout {
        id: mainColumnLayout
        anchors.fill: parent
        spacing: 1
        Repeater {
            model: root.fittingCount
            Rectangle {
                implicitWidth: root.itemHeight
                implicitHeight: root.itemHeight
                color: "orange"
            }
        }
        Item { Layout.fillHeight: true }
    }
    readonly property int itemHeight: 40
    property int fittingCount: 5
    onHeightChanged: root.updateFittingCount()

    function updateFittingCount() {
        fittingCount = Math.random() * 5
    }
}