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)