GetFenv blocker for client not working?

So I tried to make a getfenv blocker so that I could use an anti-exploit to check requests from a module script and it didn't block the requests for some reason, I would really appreciate if someone could help.

local old = getfenv
function getfenv(...)
    local t = {...}
        t[1] = 0
    return old(unpack(t))
end