Monsters do not die on 0 hp

[Zool]

When i have this scripts :
creaturescripts :

function onKill(cid, target)
    local room = getArenaMonsterIdByName(getCreatureName(target))
    if room > 0 then
        setPlayerStorageValue(cid, room, 1)
        doPlayerSendTextMessage(cid,MESSAGE_EVENT_DEFAULT,'You can enter the next room! You have 3 minutes until the teleport gets disabled again.')
    end
    return TRUE
end

Monster dont die on 0 hp whats wrong?

 

[chojrak]

What happens if you replace TRUE with true. (Lower case I mean)