The "queue" cron task on my forum is throwing this error message on 4.2

 

SELECT * FROM `ipb_cms_custom_database_6` AS `cms_custom_database_6` WHERE record_future_date=1 and record_publish_date <= 1498590544
IPS\Db\Exception: Table 'ohgunow1_ipb.ipb_cms_custom_database_6' doesn't exist (1146)
#0 /home/ohgunow1/public_html/system/Db/Select.php(371): IPS\_Db->preparedQuery('/*IPS\\core\\task...', Array, true)
#1 /home/ohgunow1/public_html/system/Db/Select.php(433): IPS\Db\_Select->runQuery()
#2 /home/ohgunow1/public_html/applications/core/tasks/publish.php(52): IPS\Db\_Select->rewind()
#3 /home/ohgunow1/public_html/system/Task/Task.php(248): IPS\core\tasks\_publish->execute()
#4 /home/ohgunow1/public_html/applications/core/modules/admin/settings/advanced.php(579): IPS\_Task->run()
#5 /home/ohgunow1/public_html/system/Dispatcher/Controller.php(85): IPS\core\modules\admin\settings\_advanced->runTask()
#6 /home/ohgunow1/public_html/applications/core/modules/admin/settings/advanced.php(34): IPS\Dispatcher\_Controller->execute()
#7 /home/ohgunow1/public_html/system/Dispatcher/Dispatcher.php(142): IPS\core\modules\admin\settings\_advanced->execute()
#8 /home/ohgunow1/public_html/admin/index.php(13): IPS\_Dispatcher->run()
#9 {main}

It appears its looking for a database that doesn't exist. Any one else with similar issue?

I'd suggest filing a Support ticket for that issue.