Calling a C++ slot from QML onActiveFocusChanged crashes under certain conditions

import Qt 4.7

ListView {
	width: 100
	height: 100
	model: app.data //QList<QObject*>

	delegate: TextInput {
		text: modelData.name 
		height: 20
		width: parent.width

		onActiveFocusChanged: {
			if(!activeFocus) {
				app.addNewProject(); // Slot that adds a new item to the model
			}
		}
	}
}