Action OnUse Exhaust?

[sapu98]

I wish to make different exhaust times for each rune on my server and i do not understand why i am not getting any exhaustion.

I am using Tibia version 10.98 and TFS version 1.3

Here is my code

local exhaust = Condition(CONDITION_EXHAUST_HEAL)
exhaust:setParameter(CONDITION_PARAM_TICKS, 1000)

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    local level = player:getLevel()
    local magLevel = player:getMagicLevel()
    local min = 50000
    local max = 50000
    if player:getCondition(exhaust) then
        player:sendTextMessage(MESSAGE_STATUS_SMALL, 'You are exhausted')
            return false
    end
    player:addCondition(exhaust)
    player:addMana(math.random(min, max))
    player:getPosition():sendMagicEffect(CONST_ME_REDSMOKE)
    return true
end