Lua Guild frag system

[mayel]

Well I'm havin this problem that I can't get the onKill() function to work.
And if u wonder, I'm making a guild frag system.
This is my script:

function onKill(cid, target, lastHit)
	if(lastHit and isPlayer(target) and getPlayerLevel(target) >= 250) then
		if getPlayerGuildId(cid) > 0 then
			db.executeQuery("UPDATE `guilds` SET `frags` = `frags` + 1 WHERE `id` = " .. getPlayerGuildId(cid) .. ";")
		end
	end
	return true
end

And this is my XML script:

<event type="kill" name="Custom" event="script" value="custom.lua"/>