[8.5] [Action] Teleport scroll, need help. Event error

[Moj mistrz]

Hi, i need help with that script. It is working, but when time is over teleport wont remove. Down ill give ya script and error in console.

local function deleteTeleport()
local tp = getTileItemById(position, 1387).uid
doSendMagicEffect(position, CONST_ME_POFF)
doRemoveItem(tp)
end

function onUse(cid, item, fromPosition, itemEx, toPosition)
local pos = { x=2395, y=1904, z=7 }
local tpTime = 30
local position = { x=2395, y=1906, z=7 }

doCreateTeleport(tpID, pos, position)
doSendMagicEffect(position, CONST_ME_MAGIC_GREEN)
doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "You have ".. tpTime .." seconds until the portal

will disapear.")
doPlayerSay(cid, "You have ".. tpTime .." seconds until the portal will disapear.",

TALKTYPE_ORANGE_1)

addEvent(deleteTeleport, tpTime * 1000)
doRemoveItem(item.uid,1)

return TRUE
end

ERROR.

[05/12/2009 22:00:37] Lua Script Error: [Action Interface]
[05/12/2009 22:00:37] in a timer event called from:
[05/12/2009 22:00:37] data/actions/scripts/teleport.luanUse

[05/12/2009 22:00:37] attempt to index a nil value
[05/12/2009 22:00:37] stack traceback:
[05/12/2009 22:00:37] [C]: in function 'getTileItemById'
[05/12/2009 22:00:38] data/actions/scripts/teleport.lua:2: in function <data/actions/scripts/teleport.lua:1>

Thanks for help.