Error when enable categories

[elfacht]

When I try to enable categories, this exception appears on save:

Argument 2 passed to craft\helpers\Db::idByUid() must be of the type string, null given, called in /Users/elfacht/htdocs/spillout/app/vendor/dolphiq/sitemap/src/services/SitemapService.php on line 127

Categories then remain disabled.

Craft 3.3.14
Plugin version: 1.2.0

[michtio]

Running into the same error now when trying to run a project-config/sync

Could this be looked at?