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I think it was remove because of this: https://community.nodebb.org/topic/7880/what-happened-with-the-users-viewing-a-topic-feature
Looks like your minfile might not be compiled properly. Ensure you have no errors on startup (check ./nodebb log or look at logs/output.log)
Thank you for your time.
Issue reported here: https://github.com/NodeBB/NodeBB/issues/4292