Bukkit

What steps will reproduce the problem?
1.Create a ticket
2.Attempt to close ticket without claiming it
3.Receive error

What is the expected output? What do you see instead?
Expected output, a closed ticket. Actual output, an error message 'an internal error occured while attempting to perform this command'

What version of the product are you using?
1.2.0

Do you have an error log of what happened?
http://pastebin.com/95Jhrqvi

Please provide any additional information below.