Our webiste is also down. Updated all Tickera plugins and whole site crashed. Contacted support who sent an updated “Tickera – Custom Template Element – product name” plugin to fix it. This took away the error for the whole site but tickets created in WooCommerce Products are not displayed and there is a ‘There has been a Critical error on this website” message where they should appear. The culprit appears to be Tickera Bridge for WooCommerce.
A ticket has been raised with Tickera but they are VERY Slow to respond. I suspect this big update has caused lots of issues.