I was trying to build a snapshot testing arena with my friend in creative. I fed wheat to horse in creative and went to ride it. My minecraft crashed and I can not rejoin server.

I expected to have rid horse and continue on with my building

I had a horrible crash with an error message of Java null Pointer Exception. I can never rejoin that server's world and I was not using realms.
(DO IT ON A SERVER)
1. Find a natural spawning horse (Yes I found one)
2. Feed it wheat
3. Right Click it to ride it wildly
4. When clicked enjoy error and crash!