#GNUSocial ActivityPub plugin error

Deleting...PHP Fatal error: Uncaught Exception: An unknown error occurred. in /gnusocial/plugins/ActivityPub/lib/postman.php:158
Stack trace:
#0 /gnusocial/plugins/ActivityPub/ActivityPubPlugin.php(831): Activitypub_postman->undo_follow() #1 /gnusocial/lib/util/event.php(89): ActivityPubPlugin->onStartUnsubscribe(Object(Profile), Object(Activitypub_profile))
#2 /gnusocial/classes/Subscription.php(219): Event::handle('StartUnsubscrib...', Array)
#3 /gnusocial/classes/Profile.php(1049): Subscription::cancel(Object(Profile), Object(Profile))
#4 /gnusocial/classes/Profile.php(975): Profile->_deleteSubscriptions() #5 /gnusocial/scripts/deleteprofile.php(78): Profile->delete()
#6 {main}
thrown in /gnusocial/plugins/ActivityPub/lib/postman.php on line 158