HI, I have the same issue of this post. https://forum.osticket.com/d/92717-post-reply-problem-verv1110-rc1-getting-500-error
I want to apply the solution, but i dont know where is the file that JLTrump mentioned.
I am working in Centos 7 with mysql.
php 7.2.17
OSticket 1.12.x
Error Log
[Wed May 08 15:35:43.572717 2019] [php7:error] [pid 31230] [client xxxxxx] PHP Fatal error: Uncaught Error: Call to a member function getName() on null in /var/www/html/mda/upload/include/class.ticket.php:2986\nStack trace:\n#0 /var/www/html/mda/upload/scp/tickets.php(194): Ticket->postReply(Array, Array, 13)\n#1 {main}\n thrown in /var/www/html/mda/upload/include/class.ticket.php on line 2986, referer: http://kb.oip.gob.pe/mda/upload/scp/tickets.php?id=17
[Wed May 08 15:37:19.757400 2019] [php7:error] [pid 31233] [client xxxx] PHP Fatal error: Uncaught Error: Call to a member function getName() on null in /var/www/html/mda/upload/include/class.ticket.php:2986\nStack trace:\n#0 /var/www/html/mda/upload/scp/tickets.php(194): Ticket->postReply(Array, Array, 13)\n#1 {main}\n thrown in /var/www/html/mda/upload/include/class.ticket.php on line 2986, referer: http://kb.oip.gob.pe/mda/upload/scp/tickets.php?id=22
Thanks