fast-import error: fatal: mark :0 not declared (but everything appears to work)

Hi,

operations like git bzr push and git bzr sync appear to work (i.e. after a push the contents appear on Launchpad), but produce a fast-import error message and a crash report in the ./git folder.

Example using git bzr push:

$ git bzr push 
17:00:49 Calculating the revisions to include ...m source
17:00:49 Starting export of 928 revisions ...
17:00:49 WARNING: not creating tag u'POST_KONVENS' pointing to non-existent revision svn-v4:af1a039a-194d-0410-835c-85bbf441475e:AnnisService/tags/POST_KONVENS:295
17:00:49 WARNING: not creating tag u'2.1_beta2' pointing to non-existent revision svn-v4:af1a039a-194d-0410-835c-85bbf441475e:tags/2.1_beta2:765
17:00:49 WARNING: not creating tag u'2.1_beta1' pointing to non-existent revision svn-v4:af1a039a-194d-0410-835c-85bbf441475e:tags/2.1_beta1:759
17:00:49 WARNING: not creating tag u'unknown_florian_converter' pointing to non-existent revision svn-v4:af1a039a-194d-0410-835c-85bbf441475e:relANNISConverter/tags:281
17:00:49 WARNING: not creating tag u'2.2.0' pointing to non-existent revision thomas@berlin-reloaded.de-20110518133025-3w632p8g7ai1tdiz
17:00:49 Exported 928 revisions in 0:00:00
fatal: mark :0 not declared
fast-import: dumping crash report to .git/fast_import_crash_14370
17:00:50 Starting import ...
17:00:50 Updating branch information ...
   branch git-bzr-test now has 725 revisions and 0 tags
17:00:50 Packing repository ...
17:01:24 Removing obsolete packs ...9
17:01:24 Imported 1 revision, updating 1 branch and 0 trees in 0:00:35
To refresh the working tree for other branches, use 'bzr update' inside that branch.
Pushed up to revision 725.ing revisions:Finishing stream:Done 10/10

And the accompanying crash report in ./git/fast_import_crash_14370:

fast-import crash report:
    fast-import process: 14279
    parent process     : 14277
    at Wed Jul 27 16:58:47 2011

fatal: mark :0 not declared

Most Recent Commands Before Crash
---------------------------------
  reset refs/tags/2.1.8
* from ::634

Active Branch LRU
-----------------
    active_branches = 0 cur, 5 max

  pos  clock name
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Inactive Branches
-----------------
refs/tags/2.1.8:
  status      : dirty
  tip commit  : 0000000000000000000000000000000000000000
  old tree    : 0000000000000000000000000000000000000000
  cur tree    : 0000000000000000000000000000000000000000
  commit clock: 0
  last pack   : 

Marks
-----
  exported to /Users/he-sk/unix/src/annis-git-bzr/.git/bzr/map/git-bzr-test-git

-------------------
END OF CRASH REPORT

Cheers, he-sk

termie / git-bzr-ng

fast-import error: fatal: mark :0 not declared (but everything appears to work) #28