How to conditionally use PropertyChanges in State?

[Kamichanw]

I want to change a property of a Loader when it is active and ignore the PropertyChanges when the Loader doesn't load. Here is the code.

import QtQuick

Window {
    visible: true
    Item {
        anchors.fill: parent
        states: [
            State {
                when: mouseArea.containsMouse
                PropertyChanges {
                    target: loader.item
                    text: "world"
                }
            }
        ]

        Loader {
            id: loader
            anchors.fill: parent
            active: false // some condition
            sourceComponent: Text {
                text: "hello"
            }
        }
    }
    MouseArea {
        id: mouseArea
        anchors.fill: parent
        hoverEnabled: true
    }
}

However, when I directly use loader.item.text: "world", it shows an error: QML PropertyChanges: Cannot assign to non-existent property "text". So, how to avoid such an error when Loader doesn't load?