How do I fix this error: attempt to index nil with 'UserId'?

This is the code that I have and I am not sure how to fix it, I have tried switching the type it is in, but that just adds another error.

local YesButton = script.Parent
local sampleDataStore = game:GetService("DataStoreService"):GetDataStore("SaveData")

YesButton.MouseButton1Click:Connect(function(Player)
    local playerKey = "Player_" .. Player.UserId

    local success, val = pcall(function()
        return sampleDataStore:RemoveAsync(playerKey)
    end)

    if success then
        print(val)
    end
end)