Put the summary of the bug you're having here
What I expected to happen was...:
Describe what you thought should happen here
What actually happened was...:
Describe what happened here
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...
Environment
OS: Windows 10 (ver 10.0, arch amd64)
Java: 1.8.0_25 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.6.61 (bootstrap 100)
Minecraft: 1.10.1 (updated Wed Jun 22 12:14:48 CEST 2016)
This is a duplicate of MC-103978.
The issue is caused by a modded server. Please do not create issues unless you are able to reproduce this on a 100% vanilla environment (Both client and server unmodded).