Lua Addon doll egg

[Fortera Global]

tfs 1.2
Hello, I have this script:
creaturescripts

local mounts = {
      [1] = {name = "Sparkion", ID = 94},

   
    }
      
function onModalWindow(player, modalWindowId, buttonId, choiceId)
    player:unregisterEvent("VibrantEgg")
    if modalWindowId == 1001 then
        if buttonId == 100 then
                        if player:getItemCount(26194) == 0 then
                                player:sendTextMessage(MESSAGE_EVENT_ADVANCE, "You must have a Vibrant Egg in your backpack!")
                        return false
                        end
            if choiceId == 0 then
                return false
            end
            player:removeItem(26194, 1)
            player:addMount(mounts[choiceId].ID)
            player:getPosition():sendMagicEffect(CONST_ME_FIREWORK_YELLOW)
        end
    end
end

When the player chooses a mount that already has and clicks on confirm, gives this error on screen:

How to remove this error? thanks

 

[Kafona]

function onUse(cid, item, fromPosition, itemEx, toPosition, isHotkey)
local player = Player(cid)
if not player:hasMount(94) then
player:addMount(94)
player:getPosition():sendMagicEffect(15)
item:remove(1)
doCreatureSay(cid, "You receive the permission to ride a sparkion.", TALKTYPE_ORANGE_1)
else
player:getPosition():sendMagicEffect(3)
player:sendTextMessage(MESSAGE_INFO_DESCR, "You already have this mount.")
end
return true
end