Comment 3 for bug 1607974

Yea, this affects me as well. With the following patch, I was able to work around the problem. I am unfamiliar with bzr - so couldn't open a PR right away.

=== modified file 'exporter.py'
--- exporter.py 2014-05-15 09:26:03 +0000
+++ exporter.py 2017-03-26 21:53:19 +0000
@@ -319,7 +319,7 @@
         mark = 1
         self.revid_to_mark[revid] = mark
         file_cmds = self._get_filecommands(bzrlib.revision.NULL_REVISION, revid)
- self.print_cmd(self._get_commit_command(ref, mark, revobj, file_cmds))
+ self.print_cmd(self._get_commit_command(ref, str(mark), revobj, file_cmds))

     def emit_commit(self, revid, ref):
         if revid in self.revid_to_mark or revid in self.excluded_revisions:
@@ -355,7 +355,7 @@
         mark = ncommits + 1
         self.revid_to_mark[revid] = mark
         file_cmds = self._get_filecommands(parent, revid)
- self.print_cmd(self._get_commit_command(ref, mark, revobj, file_cmds))
+ self.print_cmd(self._get_commit_command(ref, str(mark), revobj, file_cmds))

         # Report progress and checkpoint if it's time for that
         self.report_progress(ncommits)