Fixed as of https://github.com/NodeBB/NodeBB/commit/5ec289eee2c44f4dd49e7b2884d27dd1acb20d5c.
The problem was I was deleting tags that no longer had topics but was doing it in the wrong place. If a user couldn't see any topics the code was deleting the tag. I moved it up to actually check the tids and not the topics the user can see.
barisusakli committed to NodeBB/NodeBB
Ah, I see, It's another property that was moved under config.
No, not just fork I thought, NodeBB changes will not rely so heavily on theme.
I have plans to build second version of the theme, that will be based on Persona v3
For now, my target is to fix most critical bugs (when something doesn't work at all)