Comment 4 for bug 786942

See:
http://stackoverflow.com/questions/11365317/git-svn-clone-fails-fatal-not-a-valid-object-name/11559472#11559472

I've the same problem:
$ git svn fetch
Found possible branch point: https://xxx/svn/xxx/branches/11-07 D t-m => https://xxx/svn/xxx/branches/11-09 S t-m, 4332
fatal: Not a valid object name refs/remotes/1-11 M R 2.6
cat-file commit refs/remotes/1-11 M R 2.6: command returned error: 128

Trying to create the tag manually, but it's not allowed.
$ git tag "11-07 D t-m" remotes/11-07%20D
fatal: '11-07 D t-m' is not a valid tag name.