I was playing a zombie survival minigame map it slowed down zombies were moving slower and my sprint kept going wierd every time I try to join that world it goes to main menu but it let's me join other worlds.

Put the summary of the bug you're having here

What I expected to happen was...:
I was playing a zombies map in everything went wierd I think it was lag

What actually happened was...:
It won't let me join that world it told me to blame dinnerbone

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...play my zombie minigame and get like 450 zombie kills
3. ...try to finish the game with levers in that when it triggerd