[TFS 1.2 - Spells]Stack condition_haste on top of haste

[Lyky]

Hello,
I would like to make the Haste added on top of other active haste.
When player has utani hur active, and casts this spell it would add haste on top of it.
Let me know if this is possible, and if then how.

Regards,

    local base = 120
   local variation = 40
local combat = Combat()
combat:setParameter(COMBAT_PARAM_TYPE, COMBAT_HEALING)
combat:setParameter(COMBAT_PARAM_EFFECT, CONST_ME_MAGIC_BLUE)
combat:setParameter(COMBAT_PARAM_AGGRESSIVE, 0)
combat:setParameter(COMBAT_PARAM_DISPEL, CONDITION_PARALYZE)

local condition = Condition(CONDITION_HASTE)
condition:setParameter(CONDITION_PARAM_TICKS, 3000)
condition:setFormula(0.3, -35, 0.3, -35)
combat:setCondition(condition)

function onGetFormulaValues(cid, level, maglevel)
   local min = math.max((base - variation), ((3 * maglevel + 2 * level) * (base - variation) / 100))
   local max = math.max((base + variation), ((3 * maglevel + 2 * level) * (base + variation) / 100))
   return min, max
end

combat:setCallback(CALLBACK_PARAM_LEVELMAGICVALUE, "onGetFormulaValues")

function onCastSpell(creature, var)
   return combat:execute(creature, var)
end