Zombie Issue

[stallionsden]

So trying to get zombies in. I get them to spawn, however they end up half way in the ground. and i get this error -

 

NullReferenceException: Object reference not set to an instance of an object
  at EntityMoveHelper.UpdateMoveHelper () [0x00165] in <7568544f039447c295deb16761a8d60c>:0
  at EntityAlive.updateTasks () [0x000ff] in <7568544f039447c295deb16761a8d60c>:0
  at EntityAlive.OnUpdateLive () [0x00154] in <7568544f039447c295deb16761a8d60c>:0
  at EntityEnemy.OnUpdateLive () [0x00000] in <7568544f039447c295deb16761a8d60c>:0
  at EntityZombie.OnUpdateLive () [0x00000] in <7568544f039447c295deb16761a8d60c>:0
  at EntityAlive.OnUpdateEntity () [0x0001e] in <7568544f039447c295deb16761a8d60c>:0
  at World.TickEntity (Entity e, System.Single _partialTicks) [0x0015d] in <7568544f039447c295deb16761a8d60c>:0
  at World.TickEntitiesSlice (System.Int32 count) [0x00037] in <7568544f039447c295deb16761a8d60c>:0
  at World.TickEntitiesSlice () [0x00000] in <7568544f039447c295deb16761a8d60c>:0
  at GameManager.UpdateTick () [0x00026] in <7568544f039447c295deb16761a8d60c>:0
  at GameManager.gmUpdate () [0x00265] in <7568544f039447c295deb16761a8d60c>:0
  at GameManager.Update () [0x00000] in <7568544f039447c295deb16761a8d60c>:0
 
(Filename: <7568544f039447c295deb16761a8d60c> Line: 0)

anyone able to give me an idea on what the issue is be very appreciated.

 

[xyth]

You need to provide more information.  Custom zombies? Creaturepack zombies or ones you made?  If you made them, then there are several reasons this can happen.

 

[stallionsden]

You need to provide more information.  Custom zombies? Creaturepack zombies or ones you made?  If you made them, then there are several reasons this can happen.

Actually they are guppies, stompynzs and vals zombies lol. From earlier alphas

Had them in my zombie modifications mods to work with my ones.

Uma but looked over snufkins code and dont see where I have gone wrong. Lol.

They spawn but then go half into the ground and only happens on the first 4 zombies mainly and as soon as I go to shoot em the console goes berserk with the above error