I tried to tame a horse on a lan server.
I got a "Null Pointer Exceptions" and lost the connection to the Server.

What I expected to happen was...:
I expected to mount the horse.

What actually happened was...:
Got a null pointer exception
everytime i tried to reconnect,i got the same result.

When i had the error yesterday:
1. i connectect to the sever, sitting on a horse.
2. i leave the server with a null pointer exception
3. everytime i connect a copy of the horse appeared.

Steps to Reproduce:
1. Create new world on pc 1
2. Activate lan-option
3. Connect with PC 2
4. Spawn a Horse with PC 2 and try to mount it.
4.1 In case of the error yesterday, i tried to bind the horse with a string to a fence.