How to fix: attempt to index nil with 'entered' - lua

Question

So basically, the script is supposed to load text after the intro screen disappears, not sure what's wrong with it because it worked back in 2014 :/
The Code:
if true then
script.Parent.slowsleigh:Play()
fadegui({intro.load},{0},{1},30)
wait(1)
local titles = intro.titles
local text1 = titles.title1.Text
local text2 = titles.title2.Text
local text3 = titles.title3.Text
local text4 = titles.title4.Text
if GameData.entered == 1 then
text1 = "And you came back."
text2 = "You can't change the past."
text3 = "Pathetic."
end
titles.title1.Text = ""
titles.title2.Text = ""
titles.title3.Text = ""
titles.title4.Text = ""
--[
titles.title1.Visible = true
for i = 1, #text1 do
titles.title1.Text = string.sub(text1,1,i)
wait(0.05 + math.random(-5,10)/200)
end
And heres the script inside of ServerScriptServices
local data = game:GetService("DataStoreService"):GetGlobalDataStore()
local dataVersion = 2
local func = Instance.new("RemoteFunction",workspace)
func.Name = "GetData"
function func.OnServerInvoke(player)
local store = data:GetAsync(tostring(player.UserId))
return store
end
local set = Instance.new("RemoteEvent",workspace)
set.Name = "SetData"
set.OnServerEvent:connect(function(player,newData)
local store = data:GetAsync(tostring(player.UserId))
for i,v in pairs(newData) do
store[i] = v
end
data:SetAsync(player.UserId, store)
end)
The Error:
17:48:57.908 Players.Trl0_P90.PlayerGui.maingui.mainscript:758: attempt to index nil with 'entered' - Client - mainscript:758

Answer 1

The error is telling you that you are trying to access GameData.entered, when GameData is nil.
From the code you have shared, your issue appears to be that you are accessing data from the data store and not accounting for the fact that it might not exist. Take a look at the docs for GlobalDataStore:GetAsync() :
This function returns the latest value of the provided key and a DataStoreKeyInfo instance. If the key does not exist or if the latest version has been marked as deleted, both return values will be nil.
This could be caused by a new player joining, and there being no default data. So, one thing you could do is set up some default data in case there's a new player:
local func = Instance.new("RemoteFunction",workspace)
func.Name = "GetData"
function func.OnServerInvoke(player)
local store = data:GetAsync(tostring(player.UserId))
-- if there is no data, it might be a new player!
-- provide some new player data
if not store then
store = {
entered = 1,
foo = true,
bar = "blah",
}
end
return store
end
This way, the function will always return the correctly shaped data.