Launcher:Minecraft Launcher 1.6.61 (bootstrap 5)

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
i log onto server
What actually happened was...:
Describe what happened here
not 1 second later i crash
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...go onto a server
3. ...and it will kick you