unable to save type 'QObject*' (type id: 39)

[oivanov]

"Warning: QVariant::save: unable to save type 'QObject*' (type id: 39)"

I get this error every type when I add new string Item to model of ComboBox:
ComboBox {
editable: true
. . .
model: ListModel { ListElement { text: qsTr ("default item") }
. . .
model.insert( 0, {text: editText}) // or append...

Why so? And what does "type 39" mean?

[jpnurmi]

What is 'editText'. Is it an id of an object? Did you mean one of its properties, for instance 'editText.text'?