Does anyone know why this error happens when I try to change the table?

This is the script:

local xs= game:GetService('DataStoreService'):GetDataStore('tester8')
local at = {}
local Players = game.Players
local plr = game.Players.LocalPlayer
local ss = game:GetService('ServerStorage')
local rs = game:GetService('ReplicatedStorage')
local house = rs.house
local price = house.price
local filteringname = rs.filtering.filtername





Players.PlayerAdded:Connect(function(plr)
	at[plr] = {}
	at[plr].zs = {}
	local zs= xs:GetAsync("BOBBY"..plr.UserId)
	
	
	if zs then
		
		print("loading")
			at[plr].zs = zs
 
				local number = at[plr].zs.Okans
			 price:FireClient(plr,number)
		
	else
		
		print("first join loading base data")
		at[plr].zs.Okans = 1000
		at[plr].zs.Grade = {50,"B"}
		at[plr].zs.furniture = {}
		at[plr].zs.Grid = {}
		at[plr].zs.Orient = {}
		at[plr].zs.skin1 = {}
		at[plr].zs.skin2 = {}
		at[plr].zs.skin3 = {}
		at[plr].zs.ammount = {}
		at[plr].zs.name = {plr.Name}
		
		
		
		
		
		xs:SetAsync("BOBBY"..plr.UserId,at[plr].zs)
		
		
		local number = at[plr].zs.Okans
			 price:FireClient(plr,number)


	end
end)







local function setname (filteredText)
	at[plr].zs.name = {filteredText}
	function save()
		xs:SetAsync("BOBBY"..plr.UserId,at[plr].zs)
	end
  local s = pcall (save)
if s then
	print('good')
else
	print('bad')
end
end




filteringname.OnServerEvent:Connect(function(player,t3xt)
	print(player.Name)
	local mod = nil
	if t3xt ~= "" then
		local filteredText = ""
		local success, message = pcall(function()
			filteredText = game.Chat:FilterStringForBroadcast(t3xt, player)
		end)
		print(filteredText)
			if success then
			local hashtag = {"#"}
    for i=1,#hashtag do
        if filteredText:find(hashtag[i]) then

             mod = 'yes'
filteringname:FireClient(mod)
else
	
     mod = 'no'
setname()

	print(at[plr].zs.name[1])

	filteringname:FireClient(mod)
	print('end')
end
end
			end
		end
		end)
		

(credit to Sebby for the i loop part, thanks sebby! :D)

I have no Idea why this error happens and I've been trying to figure this out for 2 hours.

this is the error by the way : 17:54:26.202 - ServerScriptService.data:87: attempt to index field '?' (a nil value)

I haven't read the entire script, but I noticed that you aren't using the table.insert function, which might help to stabilize your script. It works like this

local myTable = {}

table.insert(myTable, "This is what I am inserting!"")

table.insert(myTable, 8)
print(table.concat, ", ")

Output: This is what I am inserting!, 8

table.concat is equal to all the contents of the table defined in the argument. the second argument is what is inserted in between the individual contents of the table.

table.remove(myTable, 2) would remove the second thing in the table.

I can't test this code myself right now, but I think the problem is that "filteredText" is nil because the FilterString failed for some reason, use if-then statements to prevent this, e.g.

if filteredText == nil then --or you can just use "if not filteredText"
	print("My filter failed")
else
	print(filteredText)
end

If this doesn't work let mew know.

EDIT: Try using this code instead of your current pcall's:

local success, message = pcall(function()
	return game.Chat:FilterStringForBroadcast(t3xt, player)
end)
if success then
	print(message) -- Prints the filtered text
else
	warn(message) -- Prints the error
end

(P.S. thanks for crediting me, always happy to help ????)