Credit to @alxy
In case a new administrator is created by a non-superuser and no permission is set directly on creation, `permissions` is not initialized correctly. Thus, when the non-superuser tries to acceess `$this->model->permissions` it is not populated with an empty array as expected.
I have actually no clue why it does work for superusers however, as they should certainly experience the same issue, but this is not the case.
1389f77390