hello guys,

I have found a problem with my mob.

If I come to the end with my mob, the game crashes with the next error.

"java.lang.IllegalArgumentException: Invalid UUID string: ".

 

It points directly at this method:

public void getSummoner() {
	if(summonerId != null && summonerUUID == null){
    		summonerUUID = UUID.fromString(summonerId);
    	}
    	if(summonerUUID != null && summoner == null){
    		summoner = worldObj.func_152378_a(summonerUUID);
    	}
    	if(summonerUUID != null){
        	summonerId = summonerUUID.toString();
        }
    	if(summoner != null && summonerUUID == null){
    		summonerUUID = summoner.getUniqueID();
    	}
}

 

And the rule that is marked is:

"summonerUUID = UUID.fromString(summonerId);".

 

Here is the whole class but I don't think you will need it:

public class EntityUndeadMage extends EntityAnimal{
/**
 * The summoner is the player that has summoned this mob.
 * This mob is programmed to help the summoner.
 */
public EntityPlayer summoner;
/**
 * The player name of the summoner.
 */
public String summonerName;
public UUID summonerUUID;
/**
 * The type of magic this mob uses.
 * 0 = healing
 * 1 = mixed
 * 2 = offensive
 */
public int mageType;
double movementSpeed = this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).getBaseValue();
/**
 * The current mana the mob has
 */
public int mobMana;
/**
 * The time this mob can't cast spells.
 */
public int manaCooldown;
public String summonerId;

/**
 * returns true if the mob should follow the summoner.
 * returns false if the mob should keep on the place where it is.
 */

public boolean guardSummoner = true;

public int fightType;

public Entity lastAttacker;

public EntityLivingBase target;



/**
 * A required constructor for a mob.
 * 
 * Do not use this constructor to summon this mob.
 * Use the constructor world, summoner, mageType, x, y, z.
 * @param world
 */
    public EntityUndeadMage(World world)
    {
        super(world);
        this.setSize(0.9F, 1.8F);
    }

    /**
     * 
     * @param world - The world the mob has to spawn.
     * @param summoner - The player that summons this mob.
     * @param mageType - The type of magic this mob will use. 0 = positive 1 = mixed 2 = offensive
     * @param x - The X location the mob has to spawn.
     * @param y - The Y location the mob has to spawn.
     * @param z - The Z location the mob has to spawn.
     */
    public EntityUndeadMage(World world, EntityPlayer summoner, int mageType, double x, double y, double z){
    	super(world);
    	this.setSize(0.6F, 1.8F);
    	setPosition(x, y, z);
        prevPosX = x;
        prevPosY = y;
        prevPosZ = z;
        this.summoner = summoner;
        this.mageType = mageType;
    	
    }

    /**
     * Returns true if the newer Entity AI code should be run
     */
    public boolean isAIEnabled()
    {
        return true;
    }
    
    /**
     * The base attributes of this mob.
     */
    protected void applyEntityAttributes()
    {
        super.applyEntityAttributes();
        this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(20.0D);
        this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.35);
    }

    /**
     * Returns the sound this mob makes while it's alive.
     */
    protected String getLivingSound()
    {
        return null;
    }

    /**
     * Returns the sound this mob makes when it is hurt.
     */
    protected String getHurtSound()
    {
        return "mob.zombie.hurt";
    }

    /**
     * Returns the sound this mob makes on death.
     */
    protected String getDeathSound()
    {
        return "mob.zombie.hurt";
    }

    protected void func_145780_a(int x, int y, int z, Block block)
    {
        this.playSound("mob.zombie.step", 0.15F, 1.0F);
    }

    /**
     * Returns the volume for the sounds this mob makes.
     */
    protected float getSoundVolume()
    {
        return 0.4F;
    }

    protected Item getDropItem()
    {
        return Items.bone;
    }

    /**
     * Drop 0-2 items of this living's type. @param par1 - Whether this entity has recently been hit by a player. @param
     * par2 - Level of Looting used to kill this mob.
     */
    protected void dropFewItems(boolean hitbyplayer, int lootinglevel)
    {
        int j = this.rand.nextInt(3) + this.rand.nextInt(1 + lootinglevel);
        int k;

        for (k = 0; k < j; ++k)
        {
            this.dropItem(Items.bone, 1);
        }

        j = this.rand.nextInt(3) + 1 + this.rand.nextInt(1 + lootinglevel);

        for (k = 0; k < j; ++k)
        {
            if (this.isBurning())
            {
                this.dropItem(Items.skull, 1);
            }
            else
            {
                this.dropItem(Items.skull, 1);
            }
        }
    }

    /**
     * Called when a player interacts with a mob. e.g. gets milk from a cow, gets into the saddle on a pig.
     */
    


    public EntityUndeadMage createChild(EntityAgeable ageable)
    {
        return new EntityUndeadMage(this.worldObj);
    }
    public void onUpdate(){
    	super.onUpdate();
    	updateMana();
    	getSummoner();
    	if(summoner != null){
    	useMagic();
    	if(guardSummoner){
    		followSummoner();
    		}
    	}
    }
public void getSummoner() {
	if(summonerId != null && summonerUUID == null){
    		summonerUUID = UUID.fromString(summonerId);
    	}
    	if(summonerUUID != null && summoner == null){
    		summoner = worldObj.func_152378_a(summonerUUID);
    	}
    	if(summonerUUID != null){
        	summonerId = summonerUUID.toString();
        }
    	if(summoner != null && summonerUUID == null){
    		summonerUUID = summoner.getUniqueID();
    	}
}

public void useMagic() {
	if(mageType == 0){
		useHealingMagic();
	}
	if(mageType == 1){
		useMixedMagic();
	}
	if(mageType == 2){
		useOffensiveMagic();
	}
}

public void useOffensiveMagic() {

}

public void useMixedMagic() {
	System.out.println(this.target);
	List partners = worldObj.getEntitiesWithinAABB(EntityUndeadMage.class, AxisAlignedBB.getBoundingBox(summoner.posX - 20, summoner.posY - 20, summoner.posZ - 20, summoner.posX + 20, summoner.posY + 20, summoner.posZ + 20));
	for (int j = 0; j < partners.size(); ++j){
		EntityUndeadMage partner = (EntityUndeadMage) partners.get(j);
		if(partner.getLastAttacker() != null && fightType == 0){
			this.target = partner.getLastAttacker();
			if(!this.target.isPotionActive(2) && mobMana >= 200){
				this.target.addPotionEffect(new PotionEffect(2, 100, 5));
				mobMana -= 200;
			}
		}
	}
	if(this.target != null && fightType == 0){
		if(!this.target.isPotionActive(2) && mobMana >= 200){
			this.target.addPotionEffect(new PotionEffect(2, 100, 5));
			mobMana -= 200;
		}
	}
}

public void useHealingMagic() {
	if(summoner.isBurning() && !summoner.isPotionActive(12) && mobMana >= 200){
		summoner.addPotionEffect(new PotionEffect(12, 40));
		mobMana -= 200;
		worldObj.spawnParticle("flame", posX, posY, posZ, 0D, 0D, 0D);
	}
	List partners = worldObj.getEntitiesWithinAABB(EntityUndeadMage.class, AxisAlignedBB.getBoundingBox(summoner.posX - 20, summoner.posY - 20, summoner.posZ - 20, summoner.posX + 20, summoner.posY + 20, summoner.posZ + 20));
	for (int j = 0; j < partners.size(); ++j){
		EntityUndeadMage partner = (EntityUndeadMage) partners.get(j);
		if(partner.summoner == summoner){
		if(partner.isBurning() && !partner.isPotionActive(12)){
			if(mobMana >= 200){
			partner.addPotionEffect(new PotionEffect(12, 40));
			mobMana -= 200;
			}
		}
		if(partner.getHealth() >= 11 && partner.getHealth() <= 19 && !partner.isPotionActive(10) && mobMana >= 20){
				partner.addPotionEffect(new PotionEffect(10, 100));
				mobMana -= 20;
		}
		if(partner.fallDistance >= 4 && mobMana >= 100){
				partner.fallDistance = 0;
				mobMana -= 100;
		}
		if(partner.getHealth() <= 10 && partner.getHealth() >= 6 && mobMana >= 100 && !partner.isPotionActive(10)){
			partner.addPotionEffect(new PotionEffect(10, 100, 1));
			mobMana -= 100;
		}
		if(partner.getHealth() <= 10 && partner.getHealth() >= 6 && partner.isPotionActive(10) && mobMana >= 100){
			partner.heal(1F);
			mobMana -= 100;
		}
		if(partner.getHealth() <= 5 && partner.getHealth() >= 1 && mobMana >= 500 && !partner.isPotionActive(10)){
			partner.addPotionEffect(new PotionEffect(10, 100, 2));
			mobMana -= 500;
		}
		if(partner.getHealth() <= 5 && partner.getHealth() >= 1 && mobMana >= 1000){
			mobMana -= 1000;
			partner.heal(5F);
		}
		}
	}
	if(summoner.getHealth() >= 11 && summoner.getHealth() <= 19 && !summoner.isPotionActive(10) && mobMana >= 20){
			summoner.addPotionEffect(new PotionEffect(10,100));
			mobMana -= 20;
	}
	if(summoner.fallDistance >= 4 && mobMana >= 100){
			summoner.fallDistance = 0;
			mobMana -= 100;
	}
	if(summoner.getHealth() <= 10 && summoner.getHealth() >= 6 && !summoner.isPotionActive(10) && mobMana >= 100){
			summoner.addPotionEffect(new PotionEffect(10, 10, 1));
			mobMana -= 100;
	}
	if(summoner.getHealth() <= 10 && summoner.getHealth() >= 6 && summoner.isPotionActive(10) && mobMana >= 100){
		summoner.heal(1F);
		mobMana -= 100;
	}
	if(summoner.getHealth() <= 5 && summoner.getHealth() >= 1 && !summoner.isPotionActive(10) && mobMana >= 500){
			summoner.addPotionEffect(new PotionEffect(10, 100, 2));
			mobMana -= 500;
	}
	if(summoner.getHealth() <= 5 && summoner.getHealth() >= 1 && mobMana >= 1000){
		mobMana -= 1000;
		summoner.heal(5F);
	}

}


public void updateMana() {
	if(mobMana <= 5000){
		mobMana += 1;
	}
	if(mobMana >= 5001){
		mobMana = 5000;
	}
	if(manaCooldown >= 1){
		manaCooldown -= 1;
	}
	if(manaCooldown <= 0){
		manaCooldown = 0;
	}
}

public void followSummoner() {
	if(summoner != null){
		if(summoner.posX >= posX + 5){

			moveEntity(movementSpeed , 0, 0);
		}
		else if(summoner.posX <= posX - 5){
			moveEntity(-1 * movementSpeed, 0, 0);
		}
		if(summoner.posZ >= posZ + 5){
			moveEntity(0, 0, movementSpeed);
		}
		else if(summoner.posZ <= posZ - 5){
			moveEntity(0, 0, -1 * movementSpeed);
		}
		if(this.onGround && summoner.posY >= posY + 2){
			moveEntity(0, 3.0, 0);
		}
		if(summoner.posX >= posX + 16 || summoner.posX <= posX - 16 ||summoner.posY >= posY + 16 || summoner.posY <= posY - 16 || summoner.posZ >= posZ  + 16|| summoner.posZ <= posZ - 16){
			if(summoner.onGround || summoner.handleWaterMovement()){
			setPosition(summoner.posX, summoner.posY, summoner.posZ);
			}
		}
		if(summoner.posX >= posX + 100 || summoner.posX <= posX - 100 || summoner.posZ >= posZ + 100 || summoner.posZ <= posZ - 100){
			setPosition(summoner.posX, summoner.posY, summoner.posZ);
		}
	}
}
public void writeEntityToNBT(NBTTagCompound nbt){
	super.writeEntityToNBT(nbt);
	if(summoner != null){
		nbt.setString("summonerUUID", summonerId);
	}
	nbt.setInteger("mobMana", mobMana);
	nbt.setBoolean("guardSummoner", guardSummoner);
	nbt.setInteger("mageType", mageType);
	nbt.setInteger("fightType", fightType);
}
public void readEntityFromNBT(NBTTagCompound nbt){
	super.readEntityFromNBT(nbt);
	mobMana = nbt.getInteger("mobMana");
	summonerId = nbt.getString("summonerUUID");
	guardSummoner = nbt.getBoolean("guardSummoner");
	mageType = nbt.getInteger("mageType");
	fightType = nbt.getInteger("fightType");
}
public boolean interact(EntityPlayer player){
	if(!worldObj.isRemote){
		if(player == summoner){
	System.out.println(summoner);
	System.out.println(summonerUUID);
	System.out.println(summonerId);
	ItemStack currentItem = player.inventory.getCurrentItem();
	if(currentItem != null){
	if(currentItem.getItem() == EnderpowerItems.positiveSpellBook && mageType != 0){
		mageType = 0;
		player.addChatMessage(new ChatComponentTranslation("I am now a healing mage."));
	}
	if(currentItem.getItem() == EnderpowerItems.mixedSpellBook && mageType != 1){
		mageType = 1;
		player.addChatMessage(new ChatComponentTranslation("I am now a mixed mage."));
	}
	if(currentItem.getItem() == EnderpowerItems.offensiveSpellBook && mageType != 2){
		mageType = 2;
		player.addChatMessage(new ChatComponentTranslation("I am now an offensive mage."));
	}
	if(currentItem.getItem() == Items.wooden_sword || currentItem.getItem() == Items.stone_sword || currentItem.getItem() == Items.iron_sword || currentItem.getItem() == Items.golden_sword || currentItem.getItem() == Items.diamond_sword){
		if(fightType == 0 && mageType != 0){
			fightType = 1;
			player.addChatMessage(new ChatComponentTranslation("I will attack every mob that attacks you or you attack."));
		}
	}
	}
	if(currentItem == null && guardSummoner == true && !worldObj.isRemote){
		guardSummoner = false;
		player.addChatMessage(new ChatComponentTranslation("I will guard it here."));
	}
	else if(currentItem == null && guardSummoner == false && !worldObj.isRemote){
		guardSummoner = true;
		player.addChatMessage(new ChatComponentTranslation("I will follow you now."));
	}
	}
		}
	return super.interact(player);
}
public boolean attackEntityFrom(DamageSource damage, float f){
	lastAttacker = damage.getEntity();
	return super.attackEntityFrom(damage, f);

}


}

Can nobody help me?