Hi,
I use OsTicket osTicket (v1.10.1) with PHP 7.2 it worked well first days, but I can't answer anymore to tickets. When I try to answer, closing or not the ticket, I get "This action requires a lock. Please try again! ". I'm still able to change the ticket status to closed or resolved normally. "Lock Semantics" is disabled in admin parameters.
Regards