Hi there.
I discovered a bug now after that upgrad. So sorry. 
I posted about in this topic: https://forum.pkp.sfu.ca/t/php-fatal-error-uncaught-error-call-to-a-member-function-getoption-on-null-after-upgrade-from-3-1-2-1-to-3-2-1-4/72272/8
I’m investigating to solve.