TypeError Can’t load the scene, when exported with animations

Hi folks,

i got an TypeError like these, after updating my working (in Verge3D 3) application to Verge3D 4:

When i export the gltf-file without animations (unchecked ‘Export Animations’ checkbox in ‘Render Properties’), the scene will load and looks just like the original, made in Verge3D 3.

I’ve got the running original version of the application here:
Still running application made with Verge3D 3

and the buggy updated one here:
Buggy updated application

Is there something i can do to get it running again and without starting from scratch?

Thanks in advance.