Get player rank from HD Admin?

I have this function in a script that allows the player to bypass the anti-exploit if it returns true.

local function HasAdmin(id)
    for i = 1,#Administrators do
        if (string.upper(id) == string.upper(Administrators[i])) then 
            return true 
        end
    end 
    local player = game.Players:GetNameFromUserIdAsync(id)
    if game.Workspace:FindFirstChild(player) then
        if game.Workspace:FindFirstChild(player).Humanoid.Health < 5 then
            return true
        end
    end
    local checkModule = require(script.CheckRank)

    checkModule.checkRank(player) -- tried a module script bc all of the HD admin scripts were inside modules (idk how use modules. this might be wrong o-o)


--[[ First attempt. Didn't work 

    local main = _G.HDAdminMain
    local plrRank = main.pdata[player].Rank
    if plrRank >= 1.5 then
        return true
    end
]]


    return false 
end

I want it so if the players rank is higher than something then it will return true. This is what I have in my module script.

local module = {}

local main = _G.HDAdminMain

function module:checkRank(player)
    local plrRank = main.pdata.Rank
    if plrRank >= 1.5 then
        return true
    end
    return false
end



return module

Error: ServerScriptService.Anti-Exploit.MuffinHacks.CheckRank:6: attempt to index nil with 'Rank'

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