Lua Weird crashes

[Glidarn]

I recently added an addon bonus syste, after that the server started to crash like after 1 -3 hours, so i removed it since i thought that that was the problem but it still crashes now so i have no clue, the only error i found was this Imageshack - crashw.png but i don't know this is it...

this is the script

UNREMOVABLE_FIELDS = {1497, 1498, 1499, 1505, 1506, 1507, 1508, 7465, 7466, 7467, 7468, 7469, 7470, 7471, 7472, 7473, 11094, 11095}

local function doRemoveField(cid, pos)
	local field = getTileItemByType(pos, ITEM_TYPE_MAGICFIELD)
	if(not isInArray(UNREMOVABLE_FIELDS, field.itemid)) then
		doRemoveItem(field.uid)
		doSendMagicEffect(pos, CONST_ME_POFF)
		return true
	end

	doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTPOSSIBLE)
	doSendMagicEffect(getPlayerPosition(cid), CONST_ME_POFF)
	return false
end

function onCastSpell(cid, var)
	local pos = variantToPosition(var)
	if(pos.x == CONTAINER_POSITION) then
		pos = getThingPos(cid)
	end

	if(pos.x ~= 0 and pos.y ~= 0) then
		return doRemoveField(cid, pos)
	end

	doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTPOSSIBLE)
	doSendMagicEffect(getPlayerPosition(cid), CONST_ME_POFF)
	return false
end

or if someone is pinging my server or something but the only thing i do know that before i had this addon system it worked perfect, i had like over 60h uptime and it never crashed.

I noticed that the map was over 100mb so i removed alot of water so its now 99.5 but i don't think that has been a problem before really.