I've started to rebuild the Members' Achievements

Error: Cannot use object of type IPS\forums\Topic\Post as array (0)
#0 /var/www/vhosts/xxx/system/Member/Member.php(6279): IPS\forums\extensions\core\AchievementAction\AnswerMarkedBest->identifier()
#1 /var/www/vhosts/xxx/applications/forums/extensions/core/AchievementAction/AnswerMarkedBest.php(306): IPS\Member->achievementAction()
#2 /var/www/vhosts/xxx/applications/core/extensions/core/Queue/RebuildAchievements.php(157): IPS\forums\extensions\core\AchievementAction\AnswerMarkedBest::rebuildRow()
#3 /var/www/vhosts/xxx/system/Task/Task.php(111): IPS\core\extensions\core\Queue\RebuildAchievements->run()
#4 /var/www/vhosts/xxx/applications/core/modules/admin/system/background.php(103): IPS\Task::runQueue()
#5 /var/www/vhosts/xxx/system/Helpers/MultipleRedirect/MultipleRedirect.php(104): IPS\core\modules\admin\system\background->IPS\core\modules\admin\system\{closure}()
#6 /var/www/vhosts/xxx/applications/core/modules/admin/system/background.php(82): IPS\Helpers\MultipleRedirect->__construct()
#7 /var/www/vhosts/xxx/system/Dispatcher/Controller.php(128): IPS\core\modules\admin\system\background->process()
#8 /var/www/vhosts/xxx/applications/core/modules/admin/system/background.php(58): IPS\Dispatcher\Controller->execute()
#9 /var/www/vhosts/xxx/system/Dispatcher/Dispatcher.php(169): IPS\core\modules\admin\system\background->execute()
#10 /var/www/vhosts/xxx/admin/index.php(15): IPS\Dispatcher->run()
#11 {main}

#0 /var/www/vhosts/xxx/init.php(827): IPS\Log::log()
#1 [internal function]: IPS\IPS::exceptionHandler()
#2 {main}

Version 5.0.1

PHP 8.2.27

Database Maria DB 10.11.8

I've tried this job again, and it failed again.

This could be a bug imo. I've seen another topic here with this very same problem.

Ive created a ticket for you, so we can take a closer look

Looks like this may be fixed now?

Yes, its been fixed in the ops ticket too :)