Group and projects without owner


Me and another friend owned a private group with several projects and lost access yesterday. We don’t know the cause yet.
Another friend don’t lost access but he’s just Maintainer not Owner. He put me with the same access and I can see the groups and projects again.
The problem now is the group and the projects do not have an owner.

Its possible re-establish this access? Is it possible not to have at least one owner ?

We use GitLab Free Plan.