Bukkit

What steps will reproduce the problem?
1.Install Herobine AI
2.Update Spigot to the latest version
3.Update your Minecraft Client to the latest version
4.Start your server and in some way get herobrine to you.

What is the expected output? What do you see instead?
I expect nothing to happen, but the server just kicks me out and sends me a message saying "Server Outdated- Pretending to be 1.7.8".

What version of HerobrineAI are you using?
The latest version

What version of Craftbukkit are you using?
Using Spigot 1.7.8 (#1387)

Do you have an error log of what happened?
Nope there are no error logs. If I get something I will post a PasteBin link on a comment.

Please provide any additional information below.
I'm guessing that they removed something from 1.7.8/1.7.9, that this plugin requires to run. And so, when lets say that Herobrine tries to make a sound that has been removed from 1.7.8/1.7.9, the player's minecraft client marks it as invalid and can't proceed so it kicks him/her out. Please fix that as fast as possible. I have also let Spigot/Craftbukkit developers know because it doensn't look like its only this plugin doing that...