Bukkit

What steps will reproduce the problem?
1. Get an item and put it into your hand.
2. Type /auction -5
3. You now made an auction that starts at $-5

What is the expected output? What do you see instead?
I'd expect an error similar to if you had not entered a number. Something like "Amount must be at least 1".

What version of the product are you using?
1.0.3 (current as of 23/05/2013)

Do you have an error log of what happened?
No actual error, just a little mistake.

Please provide any additional information below.
There's not much else. This one should be a really easy fix. :)