Lua Error in walkback.lua compare nil with number

[dhrsantan]

Spoiler: old

The following error is given.

Lua Script Error: [MoveEvents Interface]
data/movements/scripts/walkback.lua:onStepIn
data/movements/scripts/walkback.lua:2: attempt to compare nil with number
stack traceback:
          [C]: in functon `__1e`
          data/movements/scripts/walkback.lua:2: in function <data/movements/scripts/walkback.lua:1>

the walkback.lua:

function onStepIn(creature, item, position, fromPosition)
    if item.uid > 0 and item.uid <= 65535 then
        creature:teleportTo(fromPosition, false)
    end
    return true
end

Using TFS 1

running on a linux ubuntu server 14.04

Compiled worng sources. nvrm