TFS 0.X Spell with ticks tfs 0.4

[roriscrave]

Hi! How are u?
I make one spell, it will hit 10 damage on target, one hit per second and it works fine.. but have one bug...
If i (cid) use a spell on player (target), and this player (target) go into protection zone, he still continues to take damage within the protection zone, how i can solve it?

is there a better way to do this script, except in the way I did?
Spell:

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, -3.2, 1, -5.2, 1)

function onCastSpell(cid, var)

    function damageRepeat(target, times)
    if times > 0 then
        if isPlayer(cid) then
            if isCreature(target) then
                doCombat(cid, combat, var)
                addEvent(damageRepeat,1000,target,times-1)
            end
        end
    end
    end

damageRepeat(target,10)
return true
end