I got an error that kicked my char out of my own server, with the error message "internal server error".

I was able to go of my backup and recreate the crash. It happens when you jump off of a cliff on a horse, (staying in the air for too long). While riding a horse.

a copy and paste from my server log. "Stealerr" is the name of my char.

[WARNING] Failed to handle packet for Stealerr/127.0.0.1: java.lang.NullPointerException
java.lang.NullPointerException
at qq.a(SourceFile:321)
at qq.c(SourceFile:411)
at ms.a(SourceFile:677)
at nk.a(SourceFile:145)
at ms.d(SourceFile:572)
at nk.e(SourceFile:1043)
at qq.e(SourceFile:1167)
at nk.c(SourceFile:1255)
at nl.c(SourceFile:314)
at mp.c(SourceFile:93)
at qn.c(SourceFile:30)
at qq.c(SourceFile:884)
at nk.k_(SourceFile:1107)
at nl.k_(SourceFile:173)
at qq.k_(SourceFile:913)
at aan.a(SourceFile:1351)
at jb.b(SourceFile:515)
at jj.a(SourceFile:145)
at eg.a(SourceFile:136)
at ck.b(SourceFile:356)
at jj.d(SourceFile:56)
at jm.b(SourceFile:35)
at ig.b(SourceFile:30)
at net.minecraft.server.MinecraftServer.s(SourceFile:490)
at ib.s(SourceFile:262)
at net.minecraft.server.MinecraftServer.r(SourceFile:407)
at net.minecraft.server.MinecraftServer.run(SourceFile:341)
at gr.run(SourceFile:584)
[SEVERE] Reached end of stream
[SEVERE] Reached end of stream