Lua Error script action

[Fortera Global]

I can not see the error in this script, does anyone help? I tried put an exhausted..
tfs 1.2

Lua Script Error: [Action Interface]
data/actions/scripts/spike tasks/ghost detector.lua:onUse
data/actions/scripts/spike tasks/ghost detector.lua:75: attempt to compare number with nil
stack traceback:
    [C]: in function '__lt'
    data/actions/scripts/spike tasks/ghost detector.lua:75: in function <data/actions/scripts/spike tasks/ghost detector.lua:70>

if not GHOST_DETECTOR_MAP then
    GHOST_DETECTOR_MAP = {}
end

ghost_detector_area = {
    from = Position(32008, 32522, 8),
    to = Position(32365, 32759, 10)
}

local function getSearchString(fromPos, toPos)
    local distance = 0
    local direction = 0
    local level = 0

    local dx = fromPos.x - toPos.x
    local dy = fromPos.y - toPos.y
    local dz = fromPos.z - toPos.z

    level = (dz > 0) and 0 or (dz < 0) and 1 or 2

    if math.abs(dx) < 5 and math.abs(dy) < 5 then
        distance = 0
    else
        local tmp = dx * dx + dy * dy
        distance = (tmp < 10000) and 1 or (tmp < 75625) and 2 or 3
    end

    local tang = (dx ~= 0) and dy / dx or 10
    if math.abs(tang) < 0.4142 then
        direction = (dx > 0) and 3 or 2
    elseif math.abs(tang) < 2.4142 then
        direction = (tang > 0) and ((dy > 0) and 5 or 6) or ((dx > 0) and 7 or 4)
    else
        direction = (dy > 0) and 0 or 1
    end

    local text = {
        [0] = {
            [0] = "above you",
            [1] = "below you",
            [2] = "next to you"
        },
        [1] = {
            [0] = "on a higher level to the ",
            [1] = "on a lower level to the ",
            [2] = "to the "
        },
        [2] = "far to the ",
        [3] = "very far to the "
    }

    local dirs = {
        [0] = "north",
        [1] = "south",
        [2] = "east",
        [3] = "west",
        [4] = "north-east",
        [5] = "north-west",
        [6] = "south-east",
        [7] = "south-west"
    }

    return ((type(text[distance]) == "table") and text[distance][level] or text[distance]) .. ((distance ~= 0) and dirs[direction] or '')
end


local fa_exhausss_timeE = {}
local fa_exhausss_timeE1 = 2 -- em segundos

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    local stat = player:getStorageValue(SPIKE_UPPER_TRACK_MAIN)
   
    local name = player:getName()
   
    if fa_exhausss_timeE[name] or fa_exhausss_timeE[name] > os.time() then
        return player:sendCancelMessage("You are exhauted.")
    end
   
    if isInArray({-1, 3}, stat) then
        return player:sendCancelMessage(RETURNVALUE_NOTPOSSIBLE)
    end

    local current = GHOST_DETECTOR_MAP[player:getGuid()]
    if not current then
        local random = getFreeSand()
        GHOST_DETECTOR_MAP[player:getGuid()] = random
        current = random
    end

    if player:getPosition():compare(current) then   
    fa_exhausss_timeE[name] = os.time() + fa_exhausss_timeE1   
        if stat == 2 then
            item:remove()
            GHOST_DETECTOR_MAP[player:getGuid()] = nil
            player:sendTextMessage(MESSAGE_INFO_DESCR, "Report the task to Gnomilly.")
            player:sendTextMessage(MESSAGE_EVENT_ADVANCE, "You found a malignant presence, the glowing detector signals that it does not need any further data.")
        else
            GHOST_DETECTOR_MAP[player:getGuid()] = getFreeSand()           
            player:sendTextMessage(MESSAGE_EVENT_ADVANCE, 'You found a malignant presence, the glowing detector signals another presence nearby.')
        end
        player:setStorageValue(SPIKE_UPPER_TRACK_MAIN, stat+1)
    else
        player:sendTextMessage(MESSAGE_EVENT_ADVANCE, 'The detector points ' .. getSearchString(player:getPosition(), current) .. '.')
    end
    return true
end

 

[Infernum]

change or to and on line 75