Good morning. Please see below the error that is generated in owncloud.log after upgrading php.
{“reqId”:“a29WBPzfjqvhWviRZVxQ”,“level”:3,“time”:“2019-11-21T12:13:00+00:00”,“remoteAddr”:“172.18.2.241”,“user”:"–",“app”:“index”,“method”:“GET”,“url”:"/",“message”:“Exception: {“Exception”:“OCP\\Session\\Exceptions\\SessionNotAvailableException”,“Message”:”",“Code”:0,“Trace”:"#0 \/usr\/share\/nginx\/html\/owncloud\/lib\/private\/Session\/CryptoSessionData.php(159): OC\\Session\\Internal->getId()\n#1 \/usr\/share\/nginx\/html\/owncloud\/lib\/private\/User\/Session.php(750): OC\\Session\\CryptoSessionData->getId()\n#2 \/usr\/share\/nginx\/html\/owncloud\/lib\/base.php(450): OC\\User\\Session->invalidateSessionToken()\n#3 \/usr\/share\/nginx\/html\/owncloud\/lib\/base.php(587): OC::initSession()\n#4 \/usr\/share\/nginx\/html\/owncloud\/lib\/base.php(1005): OC::init()\n#5 \/usr\/share\/nginx\/html\/owncloud\/index.php(53): require_once(’\/usr\/share\/ngin…’)\n#6 {main}",“File”:"\/usr\/share\/nginx\/html\/owncloud\/lib\/private\/Session\/Internal.php",“Line”:130}"}