C++ TFS 1.3 Help with new functions

[TomCrusher]

Hello,

Working with custom functions and stuck with crashes after sending these via protocolgame. Has someone idea what I doing wrong?
Here is these:

void ProtocolGame::removeKnownCreature(uint32_t id)
{
    knownCreatureSet.insert(id);
    for (auto it = knownCreatureSet.begin(), end = knownCreatureSet.end(); it != end; ++it) {
        Creature* creature = g_game.getCreatureByID(*it);
        if (!canSee(creature)) {
            knownCreatureSet.erase(id);
            //g_game.removeCreature(id);
            return;
        }
        else {
            bool known;
            uint32_t removedKnown;
            checkCreatureAsKnown(id, known, removedKnown);
        }
    }       
}

void ProtocolGame::sendUpdateCreature(const Creature* creature, const Position& pos, uint32_t stackpos) //change name system
{
    for (auto it = knownCreatureSet.begin(), end = knownCreatureSet.end(); it != end; ++it) {
        Creature* creature = g_game.getCreatureByID(*it);
        if(it != knownCreatureSet.end()) {
              if(canSee(creature)){
                   if(creature == player){
                        NetworkMessage msg;
                        RemoveTileThing(msg, pos, stackpos);
                        removeKnownCreature(creature->getID());
                        sendMapDescription(pos);
                   }
                   else {
                    g_game.removeCreature(creature); //RemoveTileThing(creature, pos, stackpos);
                    removeKnownCreature(creature->getID());
                    sendAddCreature(creature, pos, stackpos, false);
                }
            }
            else {
                removeKnownCreature(creature->getID());
            }
        }
    }
}

void ProtocolGame::sendCreatureEmblem(const Creature* creature)
{
    if(!canSee(creature))
        return;

    uint32_t stackpos = creature->getTile()->getClientIndexOfCreature(player, creature);
    if(stackpos >= 10)
        return;

    NetworkMessage msg;
    for (auto it = knownCreatureSet.begin(), end = knownCreatureSet.end(); it != end; ++it) {
        Creature* creature = g_game.getCreatureByID(*it);
        if(it != knownCreatureSet.end()) {
            RemoveTileThing(msg, creature->getPosition(), stackpos);
            msg.addByte(0x6A);

            msg.addPosition(creature->getPosition());
            msg.addByte(stackpos);
            AddCreature(msg, creature, false, creature->getID());
        }   
    }
}