Stupid suggestions, they may work better / faster compared to search for the error:Try to revert your backup and update again - but not via git.Or: Setup a fresh installation of osTicket and import the mysql database and check if that is working. In case there's something wrong with your database, e.g. a patch was not applied correctly, you should notice it then.Beside that suggestions I have no idea right now where to start, but maybe ntozier has one.