Server Kicks Me From Riding An Untamed Hrose

Put the summary of the bug you're having here

What I expected to happen was...:
Well i went on a horse on a vanilla server hoping to tame it

What actually happened was...:
The Server Kicked Me and now i cant go back on (kicks me every time ) And it says "Java.lang.NullPointerException"

Steps to Reproduce:
1. Log On To A New Vanilla Minecraft Server
2. Spawn A Horse
3. Ride It (You don't have to tame it)