[MC-21483] Can't chat in multiplayer servers (again)

When I type anything into the chat such as "hey" or "yo", it crashes and sends me back to the Minecraft launcher.

Linked issues

Sebastian Prokopovich 2013-07-03T17:49:18Z

ayuda
help

Ancient Java. Update it.

Sebastian Prokopovich 2013-07-04T02:00:26Z

I updated my Java to the newest version, the crash keeps happening.
I don't know what's wrong.
Help.

You're playing on a custom server, complain to the plugin authors.