Problem with adding a number value and number value from data store?

http://prntscr.com/dh98vx

local DSService = game:GetService("DataStoreService")
local PlayerDataStorage = DSService:GetDataStore("usjiiid9177nxx2")

script.Parent.Add.MouseButton1Click:connect(function()
    local PlayerName = script.Parent.Parent.DataView.PlayerName.Text
    local PlayerDataSave = PlayerName.."usjiiid9177nxx2PS"
    local PlayerEXP = PlayerDataStorage:GetAsync(PlayerDataSave.."EXP")
    local Math1 = script.Parent.EXP.Text
    local Math2 = PlayerEXP
    local Answer = Math1 + Math2
    PlayerDataStorage:SetAsync(PlayerDataSave.."EXP", Answer)
    print("Data changed.")
end)

(Not the entire script, but everything else is irrelevant)

-- Enable Check

local DSService = game:GetService("DataStoreService")
local PlayerDataStorage = DSService:GetDataStore("usjiiid9177nxx2")

local StartAdminComment = "No comment."
local StartEXP = 0


game.Players.PlayerAdded:connect(function(Player)
local PlayerDataSave = Player.Name.."usjiiid9177nxx2PS"
Player:WaitForDataReady()
local EXP =  PlayerDataStorage:GetAsync(PlayerDataSave.."EXP")
local RankInAI = Player:GetRoleInGroup(2842013)
if EXP then
    stuff here
else
    print(Player.Name.." does not have saved data. Saving data...")
    PlayerDataStorage:SetAsync(PlayerDataSave.."EXP", StartEXP)
    print("Data Saved")
end
end)

I'm basically trying to + the saved value with the value the officer tries to add to the player, but I get "Player.BionicWind.PlayerGui.Database.Maing.Officer.EXP:12: attempt to perform arithmetic on local 'Math2' (a nil value)"

In the script I save it, I've tried to save it as 0. And in the script that +'s it togheter, I've tried to do it directly and without any variables being Math1 and Math2

Should I save it as 1? Or what?