CM7 Syncing error

Fetching projects: 100% (256/256), done.
Syncing work tree:  67% (172/256)  Traceback (most recent call last):
  File "/home/benjamin/cyanogenmod/system/.repo/repo/main.py", line 385, in <module>
    _Main(sys.argv[1:])
  File "/home/benjamin/cyanogenmod/system/.repo/repo/main.py", line 365, in _Main
    result = repo._Run(argv) or 0
  File "/home/benjamin/cyanogenmod/system/.repo/repo/main.py", line 137, in _Run
    result = cmd.Execute(copts, cargs)
  File "/home/benjamin/cyanogenmod/system/.repo/repo/subcmds/sync.py", line 467, in Execute
    project.Sync_LocalHalf(syncbuf)
  File "/home/benjamin/cyanogenmod/system/.repo/repo/project.py", line 1052, in Sync_LocalHalf
    lost = self._revlist(not_rev(revid), HEAD)
  File "/home/benjamin/cyanogenmod/system/.repo/repo/project.py", line 1855, in _revlist
    return self.work_git.rev_list(*a, **kw)
  File "/home/benjamin/cyanogenmod/system/.repo/repo/project.py", line 2000, in rev_list
    p.stderr))
error.GitError: projects/marvel/kernel_htc_msm7227.git rev-list ('^77e3cb27cf8eb9996575c1cf3b99902f03878455', 'HEAD', '--'): fatal: bad object 77e3cb27cf8eb9996575c1cf3b99902f03878455