Code main fuction calls error. Possible fix?

Ok so I'm making a code gui. It was working until I introduced a code that has a limit to it. Now that there is a limit it just breaks.

The error im getting is :

ServerScriptService.Codes:12: attempt to index local 'CheckUsage' (a nil value)
Stack Begin
Script 'ServerScriptService.Codes', Line 12 - upvalue CheckLimited
Script 'ServerScriptService.Codes', Line 38
Stack End

My code for reference:

local ActiveCodes = game.ServerStorage.ActiveCodes

local Remote = game.ReplicatedStorage.Code

local Data = game:GetService("DataStoreService")
local Getcode = Data:GetDataStore("UsedCode")
--local Get = Getcode:GetAsync(Plr.UserId .. Code)

local function CheckLimited(CodeObj)
    local CheckUsage = Getcode:GetAsync("GlobalUseOf" .. CodeObj.Name)
    if CheckUsage == nil then
        CheckUsage:SetAsync("GlobalUseOf" .. CodeObj.Name, 0)
        return 0
    else
        return CheckUsage
    end
end

local function SaveLimited(CodeObj)
    local GetUsage = Getcode:GetAsync("GlobalUseOf" .. CodeObj.Name)
    if GetUsage ~= nil then
        GetUsage:SetAsync("GlobalUseOf" .. CodeObj.Name, GetUsage + 1)
    end
end

local function OnCode(Plr, Code)
    local Get = Getcode:GetAsync(Plr.UserId .. Code)

    local Stats = Plr:WaitForChild("leaderstats")
    local CodeObj = game.ServerStorage.ActiveCodes:FindFirstChild(Code)

    if not CodeObj then return "No active code called " .. Code end

    local RequiredStat = Stats:WaitForChild(CodeObj.Stat.Value)
    local CodeAmmount = CodeObj.Value

    if CodeObj:FindFirstChild("Limit") then
        if CheckLimited(CodeObj) < 10 then
            if Get == nil then
                if RequiredStat.Name == "Shards" then
                    RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats.Rebirths.Value + 1))
                elseif RequiredStat.Name == "Rebirths" then
                    RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Super Rebirths"].Value + 1))
                elseif RequiredStat.Name == "Super Rebirths" then
                    RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Ultra Rebirths"].Value + 1))
                elseif RequiredStat.Name == "Ultra Rebirths" then
                    RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Omega Rebirths"].Value + 1))
                elseif RequiredStat.Name == "Omega Rebirths" then
                    RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Master Rebirths"].Value + 1))
                else
                    RequiredStat.Value = RequiredStat.Value + (CodeAmmount)
                end
                SaveLimited(CodeObj)
                Getcode:SetAsync(Plr.UserId .. Code, true)
            else
                return "Code already Used"
            end
        else
            return "Code Limit Reached"
        end
    else
        if RequiredStat.Name == "Shards" then
            RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats.Rebirths.Value + 1))
        elseif RequiredStat.Name == "Rebirths" then
            RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Super Rebirths"].Value + 1))
        elseif RequiredStat.Name == "Super Rebirths" then
            RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Ultra Rebirths"].Value + 1))
        elseif RequiredStat.Name == "Ultra Rebirths" then
            RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Omega Rebirths"].Value + 1))
        elseif RequiredStat.Name == "Omega Rebirths" then
            RequiredStat.Value = RequiredStat.Value + (CodeAmmount * (Stats["Master Rebirths"].Value + 1))
        else
            RequiredStat.Value = RequiredStat.Value + (CodeAmmount)
        end
        Getcode:SetAsync(Plr.UserId .. Code, true)
    end
end

Remote.OnServerInvoke = OnCode

Hope someone can help me!