I tried upgrading to 5.1 BETA and it failed "There are no applications available to upgrade".

Since then ACP acts weird and every few page loads we receive this error:

SELECT s.* FROM cloud_quests_scorecards AS s  LEFT JOIN cloud_quests AS q ON s.score_quest_id=q.quest_id WHERE s.score_member_id=1 and s.score_status=0 and s.score_dismissed=0
IPS\Db\Exception: Unknown column 's.score_dismissed' in 'where clause' (1054)
#0 /var/www/html/5010003/system/Db/Select.php(402): IPS\Db->preparedQuery('/*b334808::b334...', Array, true)
#1 /var/www/html/5010003/system/Db/Select.php(460): IPS\Db\Select->runQuery()
#2 [internal function]: IPS\Db\Select->rewind()
#3 /var/www/html/5010003/applications/cloud/sources/Quest/Quest.php(741): IteratorIterator->rewind()
#4 /var/www/html/5010003/applications/cloud/extensions/core/Loader/forumsFrontForumsTopic.php(81): IPS\cloud\Quest::activeQuests()
#5 /var/www/html/5010003/system/Dispatcher/Front.php(186): IPS\cloud\extensions\core\Loader\forumsFrontForumsTopic->js()
#6 /var/www/html/5010003/system/Dispatcher/Dispatcher.php(129): IPS\Dispatcher\Front->init()
#7 /var/www/html/5010003/index.php(16): IPS\Dispatcher::i()
#8 {main}

Is this on your Cloud or self-hosted install? I assume the former with that stack trace but want to confirm as you posted in the self-hosted forum

Cloud yes.

TypeError: Cannot assign bool to property IPS\Session\Store\Redis::$onlineUsers of type ?array (0)
#0 /var/www/sitefiles/b334808/applications/homepage/sources/Feed/Feed.php(167): IPS\Session\Store\Redis->getOnlineUsers(3)
#1 /var/www/sitefiles/b334808/applications/homepage/sources/Feed/Feed.php(34): IPS\homepage\Feed::build()
#2 /var/www/sitefiles/b334808/applications/homepage/modules/front/home/home.php(29): IPS\homepage\Feed::overview()
#3 /var/www/html/5001907/system/Dispatcher/Controller.php(139): IPS\homepage\modules\front\home\home->manage()
#4 /var/www/sitefiles/b334808/applications/homepage/modules/front/home/home.php(24): IPS\Dispatcher\Controller->execute()
#5 /var/www/html/5001907/system/Dispatcher/Dispatcher.php(172): IPS\homepage\modules\front\home\home->execute()
#6 /var/www/html/5001907/index.php(16): IPS\Dispatcher->run()
#7 {main}

Looks like not all files got applied. I have reapplied them and ran the upgrader for you but ran into a problem so I have moved this to a ticket to get it further investigate. Please watch your email for further info.

Looks like I got too excited and should've waited for the stable version. 😄

All good, will keep an eye out.

Thanks for the quick resolving guys!