Solved Removing a group's parent?

On my Rust Server i did the command "oxide.group parent default vip". That command did so all default players got vip permissions. I have no idea how to remove the group parent. I tryed to delete the vip group and maked a new one. But i did not have any luck with that. The command i ment to do were "oxide.group parent vip default".
Do any of you guys know how to remove a parent group??

 

Thanks man