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In _postDelete of the entity, you are doing:

[php]

/** @var \XF\Repository\UserAlert $alertRepo */

$alertRepo = $this->repository('XF:UserAlert');

$alertRepo->fastDeleteAlertsFromUser($this->BannedBy, 'thread', $this->thread_id, 'reply_ban');

[/php]

It shouldn't be BannedBy but User here.

Clément