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Happend to me in build release330-200111292300 when I was unmounting a JavaCVS filesystem. I have had opened one file in the text editor, one file in VCS Groups and Versioning Explorer. Happend to me just once. I was not able to reproduce it.
Created attachment 3639 [details] The Exception
seems to be a duplicate issue of #18067 to me. It is already fixed in main trunk and release33. I'll be requesting it to come to release330 as well. *** This issue has been marked as a duplicate of 18067 ***
Verified as duplicate.
Resolved for 3.4.x or earlier, no new info since then -> closing.