Cannot remove FishEye Repository Path in project administration page

When a user attempts to remove a configured repository path from "Project Administration > Settings", the following behavior is observed:

1. User clicks on the Delete button, like so: DeletePath1.jpg
2. In the next page, the confirmation dialog appears, and the user clicks on Delete, like so: DeletePath2.jpg
3. After clicking the button, nothing happens and the following text appears on the page (DeletePath3.jpg):

   Are you sure you want to remove the repository path mapping null from project null?
   

4. Clicking on the Delete button does nothing, and the page stays at the message as per above. Going back to the Project Administration page, the repository path is still there and not deleted.

STEPS TO REPRODUCE

1. Install JIRA 6.0.3
2. Install FishEye 3.0.1. Add a Subversion, Perforce or Git repository.
3. Configure application link from JIRA to FishEye
4. Create a new project, and configure a Repository Path to one of the repositories created in step 2.
5. Try to delete the repository path.

OTHER INFORMATION

1. Tested on Subversion/Perforce/Git repositories.
2. Tested on Trusted/Basic authentication for the app link.
3. There are no errors in the atlassian-jira.log files.