@zDrakon hopefully this fixes your problem.
This update fixes a bug where if already in a chat room, you can /cr join that chat room again.
Users, please note that I'm moving support to GitHub issues, as it's easier to organize. If there are any further problems or bugs with the plugin, please open an issue on GitHub. You can reach this page at http://www.github.com/evan3334/ChatRooms/issues.