Service Desk creating duplicate tickets

Steps to Reproduce:

1. Have a JSD project
2. Visit the customer portal
3. Select the issue to create
4. Fill out the fields
5. Hit Create (and keep hiting Create until the window closes)
   See screencast: http://screencast.com/t/kVnq50ajo

Expected Results:
JSD would disable the Create button and keep it that way until the entire creating process is done.

Actual Results:
JSD disables the Create button for a while, but before the window closes, it re-activates it again (which is probably causing this issue).

Workaround:
Wait for JSD to dismiss that window.

Add-on Version:
JIRA Service Desk v2.4-OD-05-001-D20150322T231214