Null pointer after trying to ride dying horse

What I expected to happen was...:
Being able to ride the horse but then be kicked off when it died.

What actually happened was...:
Null pointer and keep getting kicked from LAN server upon entering. Horse dies every time you enter the server.

Steps to Reproduce:
1. Spawn a horse
2. Kill it with a splash potion or other means
3. Try to ride it right before killing it