It is not due to Lock content by Omar G.
I have created 3 subdomains.
Mybb1806 with PHP 7.1
Mybb1822 with PHP 7.1
Mybb1822 with PHP 7.3
On all fresh copy, I make a thread and click on reply in the user post. (
https://xxxxxxxx.com/mybb180671/newreply...&replyto=1)
On Mybb1806 with PHP 7.1 have above error. So it is due to Mybb1806 interaction with PHP 7.1 which I recently upgraded from PHP 5.6 to 7.1.
On Mybb1822 with PHP 7.1 & Mybb 1822 with PHP 7.3, It works fine.
So, if any have a solution to work reply on user post in Mybb1806 with PHP 7.1... I can not upgrade Mybb1806 with PHP 7.1 to latest Mybb1822 with PHP 7.1/7.3...
Hope you guys understand.
Thank you.