[Classpathx-javamail] Exception when listing all NNTP folders

[Hash9]

When attempting to list all NNTP folders on news.mozilla.org I get the
following Exception.

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: 
String index out of range: -1
        at java.lang.String.substring(String.java:1768)
        at gnu.inet.nntp.GroupIterator.nextGroup(GroupIterator.java:86)
        at gnu.mail.providers.nntp.NNTPRootFolder.list(
                NNTPRootFolder.java:97)
        at javax.mail.Folder.list(Folder.java:290)
Java Result: 1

Any help would be appreciated.

Thanks,
Hash9