That's the problem. I can't 🙂
When editing the site I instanty get a screen with the error, I can't go anywhere else. Delete an reinstall the theme doesn't help either.
Here you see the full code which seems affected.
Then you see:
Trying to get property 'alias' of non-object
On line 19 it says: data-target="#<?= $this->getId('components-item-modal-'.$component->alias) ?>"
"Trying to get property 'alias' of non-object"
I can show you printscreens in private?