Changing viewport settings after reloading presentation crashes

Steps to reproduce:

1) Open simpleqml example
2) Modify main.qml slightly by adding inside Studio3D:

ViewerSettings {
     id: viewSettings
}

and for example toggle camera button to:

viewSettings.setScaleMode(ViewerSettings.ScaleModeFit);

3) Run
4) Press "Reload"
5) Press "Toggle camera"
-> Crash