I have 1.6.2 when I tried to say hello on a server(ip:mc.desirecraft .net) and my Minecraft crashed!

Put the summary of the bug you're having here
Whenever I chat in a server Minecraft crashes
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. Log on to the following sever mc.desirecraft.net
2. ...claim a plot and go to it
3. ...then chat anything