Make a button disappear generates warning

[alecs26]

Hello,

When I press a button, I want this button to disappear. That seems simple but it generates a weird error. When I minimize and reopen my application window, the console says "QQuickButton QVariant(Invalid) QRect(0,0 0x0)".

Here is the QML code:

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0

ApplicationWindow
{
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Button
    {
        id: buttonEnglish
        visible:true
        width: 200
        height: 200

        onClicked:
        {
            buttonEnglish.visible=false
        }
    }
}

I am using Qt with MinGW 5.7 on Windows 8.

I really don't understand what can cause this...

Thank you very much,

Alex