Lua Attempt to index a number value

[CastorFlynn]

I don't know exactly where the problem is with this spectator check to clean the room, does anyone have an opinion?

Lua Script Error: [Main Interface]
in a timer event called from:
(Unknown scriptfile)
attempt to index a number value
stack traceback:
[C]: at 0x5555556b8800
[C]: in function 'getSpectators'
data/actions/scripts/roshamuul/prison/keys.lua:52: in function <data/actions/scripts/roshamuul/prison/keys.lua:51>

-------------THIS SCRIPT WAS MADED BY VANKK AT 15TH DECEMBER 2016 AT 4 P.M (GMT - 3) -------------

local config = {
    [22606] = {
        targetId = 22636, -- Target ID.
        bossName = 'Zavarash', -- boss name
        keyPlayerPosition = Position(33608, 32394, 11), -- Where the player should be.
        newPosition = Position(33567, 32422, 12), -- Position to teleport
        bossPosition = Position(33565, 32418, 12), -- Boss Position
        centerPosition = Position(33567, 32422, 12), -- Center Room
        exitPosition = Position(33611, 32377, 11), -- Exit Position
        rangeX = 20, -- Range in X
        rangeY = 20, -- Range in Y
        time = 15, -- time in minutes to remove the player
    },
    [22605] = {
        targetId = 22634, -- Target ID.
        bossName = 'Horadron', -- boss name
        keyPlayerPosition = Position(33603, 32394, 11), -- Where the player should be.
        newPosition = Position(33607, 32421, 12), -- Position to teleport
        bossPosition = Position(33606, 32417, 12), -- Boss Position
        centerPosition = Position(33607, 32421, 12), -- Center Room
        exitPosition = Position(33611, 32377, 11), -- Exit Position
        rangeX = 20,
        rangeY = 20,
        time = 15, -- time in minutes to remove the player
    },
    [22604] = {
        targetId = 22638, -- Target ID.
        bossName = 'Terofar', -- boss name
        keyPlayerPosition = Position(33614, 32394, 11),  -- Where the player should be.
        newPosition = Position(33526, 32421, 12), -- Position to teleport
        bossPosition = Position(33524, 32418, 12), -- Boss Position
        centerPosition = Position(33526, 32421, 12), -- Center Room
        exitPosition = Position(33611, 32377, 11), -- Exit Position
        rangeX = 20,
        rangeY = 20,
        time = 15, -- time in minutes to remove the player
    }
}

local function roomIsOccupied(centerPosition, rangeX, rangeY)
    local spectators = Game.getSpectators(centerPosition, false, false, rangeX, rangeX, rangeY, rangeY)
    if #spectators ~= 0 then
        return true
    end

    return false
end

function clearBossRoom(playerId, centerPosition, rangeX, rangeY, exitPosition)
    local spectators, spectator = Game.getSpectators(centerPosition, false, false, rangeX, rangeX, rangeY, rangeY)
    for i = 1, #spectators do
        spectator = spectators[i]
        if spectator:isPlayer() and spectator.uid == playerId then
            spectator:teleportTo(exitPosition)
            exitPosition:sendMagicEffect(CONST_ME_TELEPORT)
        end

        if spectator:isMonster() then
            spectator:remove()
        end
    end
end

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    local tmpConfig = config[item.itemid]
    if not tmpConfig then
        return true
    end

    if target.itemid ~= tmpConfig.targetId then
        return true
    end

    local creature = Tile(tmpConfig.keyPlayerPosition):getTopCreature()
    if not creature or not creature:isPlayer() then
        return true
    end

    if roomIsOccupied(tmpConfig.centerPosition, tmpConfig.rangeX, tmpConfig.rangeY) then
        player:sendCancelMessage("There is someone in the room.")
        return true
    end

    local monster = Game.createMonster(tmpConfig.bossName, tmpConfig.bossPosition)
    if not monster then
        return true
    end

    -- Send message
    player:sendTextMessage(MESSAGE_EVENT_ADVANCE, 'You have entered an ancient demon prison cell!')
    player:sendTextMessage(MESSAGE_EVENT_ADVANCE, 'You have fifteen minutes to kill and loot this boss, else you will lose that chance.')

    -- Let's roll
    addEvent(clearBossRoom, 60 * tmpConfig.time * 1000, player:getId(), tmpConfig.centerPosition, tmpConfig.rangeX, tmpConfig.rangeY, tmpConfig.exitPosition)
    item:remove()
    player:teleportTo(tmpConfig.newPosition)
    player:getPosition():sendMagicEffect(CONST_ME_TELEPORT)
    return true
end