@baris Hi Baris, thanks for your testing. I just checked it. For the register users, 0 or other numbers works. But for admin, only 0 works. If I set it as 1 or something else, the green invite button in the xxx.com/users disappears.
It looks exactly as here: https://community.nodebb.org/topic/14603/invitation-register-bug-of-the-latest-nodebb
But I checked the solution as posted here: https://github.com/NodeBB/NodeBB/commit/8f4b99a41c6496cbdaaf489f16ecbe261d6c4a79, the source code seems different.