I seriously can't explain it, I've tried everything?

So, what this script does is it saves stats, makes level gui above your head, etc. But, I ran into an issue. Upon adding "level.Value = OkAwesome:GetAsync(plr.UserId) or 0" to my script nothing past that point would work. This is the issue because if I get rid of it it magically works again. Here is my code: also im not very good at scripting so a lot of things probably look unreadable for people that know how ok here

local DataStore = game:GetService("DataStoreService")
local OkAwesome = DataStore:GetDataStore("OkSoLetsSeeIfThisWorks")
game.Players.PlayerAdded:Connect(function(plr)
    local leaderstats = Instance.new("Folder",plr)
    leaderstats.Name = "leaderstats"
    local level = Instance.new("IntValue",leaderstats)
    level.Name = "Level"
    level.Value = OkAwesome:GetAsync(plr.UserId) or 0
    local stats = Instance.new("Folder",plr)
    stats.Name = "Stats"
    local currentExperience = Instance.new("IntValue",stats)
    currentExperience.Name = "currentExperience"
    currentExperience.Value = OkAwesome:GetAsync(plr.UserId) or 0
    plr.CharacterAdded:connect(function(character)
        local levelGui = game.ReplicatedStorage.levelGui:Clone()
        levelGui.Parent = character.Head
        levelGui.TextLabel.Text = "Level "..level.Value
        character.Humanoid.Died:Connect(function()
            local tag = character.Humanoid:FindFirstChild("creator")
            if tag ~= nil then
                local player = tag.Value
                local reward = 1

                local statz = player:WaitForChild("Stats")
                statz.currentExperience.Value = statz.currentExperience.Value + reward
            end
        end)
    end)
    level.Changed:connect(function(v)
        plr.Character.Head.levelGui.TextLabel.Text = "Level "..v
        OkAwesome:SetAsync(plr.UserId, level.Value)
    end)
    currentExperience.Changed:connect(function(v)
        plr.PlayerGui.xp.exp.Text = currentExperience.Value.." / 10"
        if v == 10 then
            level.Value = level.Value + 1
            currentExperience.Value = 0
        end
        OkAwesome:SetAsync(plr.UserId, currentExperience.Value)
    end)
end)

game.Players.PlayerRemoving:Connect(function(plr)
local currentExperience = plr.Stats.currentExperience
local level = plr.leaderstats.Level
OkAwesome:SetAsync(plr.UserId, currentExperience.Value)
OkAwesome:SetAsync(plr.UserId, level.Value)
end)