Lua Anti-AOE Error cant mark player.

[beliar34]

I was looking for anti aoe script i make my own what works but with bugs and then i make this one:

function onStatsChange(cid, attacker, type, combat, value)
    if(attacker and isPlayer(attacker) and (type == STATSCHANGE_HEALTHLOSS or type == STATSCHANGE_MANALOSS) and getCreatureName(getCreatureTarget(attacker)) ~= getCreatureName(cid)) then
        if combat ~= COMBAT_HEALING then
    return doPlayerSendCancel(cid, 'You must mark player.') and false
end
end
return true
end
function onCombat(cid, target) 
    if(target and isPlayer(target) and getCreatureName(getCreatureTarget(cid)) ~= getCreatureName(target)) then 
    return doPlayerSendCancel(cid, 'You must mark player.') and false
end
return true 
end

This script works but i cant mark player any help plz