cannot assign end date on attribute def priv assigned to a group.

it navigates to the group membership screen for the group and gives this exception

Error: edu.internet2.middleware.grouper.exception.MemberAddException: membership cannot be circular, Exception in save: edu.internet2.middleware.grouper.Membership, edu.internet2.middleware.grouper.hibernate.ByObject@1945de94, Problem in HibernateSession: HibernateSession (5ac82fdb): notNew, notReadonly, READ_WRITE_NEW, activeTransaction, session (2afb55d2), Exception in save: edu.internet2.middleware.grouper.Membership, ByObjectStatic, query: ', cacheable: null, cacheRegion: null, entityName: ImmediateMembershipEntry, tx type: null, membership: group: test:testGroup, subject: 6582e92034274fa4a6277697f694618e, field: members, uuid: null, startDate: 2021-04-01 00:00:00.0, endDate: null, , group name: test:testGroup, subject: Subject id: 6582e92034274fa4a6277697f694618e, sourceId: g:gsa, field: members, Problem in HibernateSession: HibernateSession (6638c612): notNew, notReadonly, READ_WRITE_NEW, activeTransaction, session (2afb55d2), Problem in HibernateSession: HibernateSession (450febca): notNew, notReadonly, READ_WRITE_NEW, activeTransaction, session (2afb55d2), Problem in HibernateSession: HibernateSession (2a3eed0b): new, notReadonly, READ_WRITE_NEW, notActiveTransaction, session (2afb55d2), Problem calling method saveMembership on edu.internet2.middleware.grouper.grouperUi.serviceLogic.UiV2Membership