Something wrong with Group Service?

Currently, I'm trying to make a script that changes the leaderboard to add in allies/enemies, but for some reason it isn't working. The outcome of the problem is the string not being created but whenever I remove the following part, it is. I've narrowed the problem down to the GroupService functions but I have no idea why it's not functioning correctly.

For some reason, when the following GroupService part of the script is implemented, it causes a failure in calling a function. Whenever I remove it, the function is called normally. Here's the GroupService parts of the script:

AllyList = game:GetService("GroupService"):GetAlliesAsync(xxxxxxx)
EnemyList = game:GetService("GroupService"):GetEnemiesAsync(xxxxxxx)
Allies = {}
Enemies = {}


for i, v in pairs(AllyList:GetCurrentPage()) do
    table.insert(Allies, v.Id)
    if not AllyList.IsFinished then
        AllyList:AdvanceToNextPageAsync()
    end
end

for i, v in pairs(EnemyList:GetCurrentPage()) do
    table.insert(Enemies, v.Id)
    if not EnemyList.IsFinished then
        EnemyList:AdvanceToNextPageAsync()
    end
end

Here's the function that is failing to be called (this is after the table insert script by the way and is properly connected to a new player joining):

function CheckRanks(newPlayer)
    newPlayer:WaitForChild("leaderstats")
    local stats = newPlayer:findFirstChild("leaderstats")
    local ranks = Instance.new("StringValue")
    ranks.Name = "Ranks"
    ranks.Parent = stats
    if SecurityMode == "None" then
        if CheckIfSpy(newPlayer) then
            ranks.Value = "xxx"
        end
        if ranks.Value ~= nil then
            for i, v in pairs(Allies) do
                if newPlayer:IsInGroup(v) then
                    if ranks.Value ~= nil then
                        ranks.Value = "Ally"
                    end
                end
            end
        end
        if ranks.Value ~= nil then
            for i, v in pairs(Enemies) do
                if newPlayer:IsInGroup(v) then
                    if ranks.Value ~= nil then
                        ranks.Value = "Adversary"
                    end
                end
            end
        end
    elseif SecurityMode == "Lax" then
        if CheckIfSpy(newPlayer) then
            ranks.Value = "xxxxxxxxxxxxxxxx" .. newPlayer:GetRoleInGroup(xxxxxxx)
        elseif newPlayer:IsInGroup(xxxxxxx) then
            ranks.Value = "xxxxxxxxxxxxxxxx" .. newPlayer:GetRoleInGroup(xxxxxxx)
        elseif newPlayer:IsInGroup(xxxxxxx) then
            ranks.Value = "xxxxxxxxxxxxxxxxxxxxxxx " .. newPlayer:GetRoleInGroup(xxxxxxx)
        elseif newPlayer:IsInGroup(xxxxxxx) then
            ranks.Value = "xxxxxxxxxxxxxxxxxxxxxxx" .. newPlayer:GetRoleInGroup(xxxxxxx)
        end
    elseif SecurityMode == "Strict" then
        if CheckIfSpy(newPlayer) then
            ranks.Value = "xxxxxxxxxxxxxxxx" .. newPlayer:GetRoleInGroup(xxxxxxx)
        elseif newPlayer:IsInGroup(xxxxxxx) then
            ranks.Value = "xxxxxxxxxxxxxxxxxxxxxxx" .. newPlayer:GetRoleInGroup(xxxxxxx)
        elseif newPlayer:IsInGroup(xxxxxxx) then
            ranks.Value = "xxxxxxxxxxxxxxxxxxxxxxx" .. newPlayer:GetRoleInGroup(xxxxxxx)
        elseif newPlayer:IsInGroup(xxxxxxx) then
            ranks.Value = "xxxxxxxxxxxxxxxx " .. newPlayer:GetRoleInGroup(xxxxxxx)
        end
    end
    ranks.Value = "Visitor/Floater"
end

game.Players.PlayerAdded:connect(CheckRanks)

EDIT #1: Fixed the table insert from v.groupId to v.Id and it is now returning the actual values instead of nil but the problem still arises. I added new information that is crucial to my problem.

Note: I have a valid groupID in place of the x's. I just don't want to be stalked.