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Hi,
we have deleted a user which was a administrator and founder of a group. after that we checked what happens to the administrator position. the position was not passed to another member, so nobody was a administrator but the group was available. how can you fix it?
there must be a possibility that an administrator is present even if the founder has deleted his profile.
The fact that user is not be deleted completely, just be disabled from user manager. Actually the admin of your site should get the notif for this delete user action, and the admin will process to completely delete the user manually from Jomsocial User monitor.