Help w/ Tables

[Swiftone]

This bit of code works great on my listen server but when I try it on my dedicated I get this error:

[Error] Line 17: Attempt to compare number with nil.

[lua]
local MapList = file.Read("ttt/MapCoolDownList.txt", "DATA")
local MapList_TableForm = util.JSONToTable( MapList )
local function AddMaps()

if ( !file.IsDir( "ttt", "DATA" ) ) then file.CreateDir( "ttt" ) end

local CurrentMap = game.GetMap()

if !table.HasValue(MapList_TableForm,CurrentMap) then
table.insert(MapList_TableForm,1,CurrentMap)
end

file.Write( "ttt/MapCoolDownList.txt", util.TableToJSON( MapList_TableForm ) )

if table.GetLastKey(MapList_TableForm) >= 6 then --This line throws an error
table.remove(MapList_TableForm, 6 )
file.Write( "ttt/MapCoolDownList.txt", util.TableToJSON( MapList_TableForm ) )
end

end
hook.Add("Initialize", "AddMapstoCooldownList", AddMaps )
[/lua]

[EvacX]

Did you even bother reading your error? Your "table.GetLastKey( MapList_TableForm )" is returning nil and you can't compare nothing with a number.

[Swiftone]

[QUOTE=EvacX;43010641]Did you even bother reading your error? Your "table.GetLastKey( MapList_TableForm )" is returning nil and you can't compare nothing with a number.[/QUOTE]

Why don't we just avoid the counter productive responses. I don't need you to elaborate on the error, I understand the error just fine. What I don't understand is why it's throwing an error on a dedicated and not a listen server.

[editline]28th November 2013[/editline]

Thanks for the fix z-machine!

Replaced the broken line with:
[lua]
if ( table.GetLastKey(MapList_TableForm) or 6 ) then
[/lua]