Put the summary of the bug you're having here
What I expected to happen was...:
The map to update as usual
What actually happened was...:
A chunk based crash of some sort.
Steps to Reproduce:
1. Run new .jar on my server that I've been playing on since beta.
2. ...
3. ...
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
That's because you are in a chunk that contains a chest, which had its data value removed. MC-57470