Lua exa ina (cancel invisibility) only works on monster

[chupaescadatri]

my invisibility cancel script only works on monsters, player does not work
Does anyone know how to solve it?

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_MAGIC_RED)
setCombatParam(combat, COMBAT_PARAM_DISPEL, CONDITION_INVISIBLE)

local area = createCombatArea(AREA_CIRCLE3X3)
setCombatArea(combat, area)

function onCastSpell(cid, var)
    return doCombat(cid, combat, var)
end