Bukkit

What steps will reproduce the problem?
1. make an 1.7.2 server
2.try joining with 1.7.6 and above
3.i will give you an error at the client side saying "invalid UUID string". Server will only show "connected" and "disconnected"

What version of the product are you using?
1.0.0 - i think the latest

Do you have an error log of what happened?
no

Please provide any additional information below.
i set the protocol to 4, highers are saying "i'm still 1.7.2"

i provived a sreenshot of the client side error