Running a scratch build fails with a TypeError:

bericote [~] % koji --debug build --scratch rawhide rpm/SRPMS/nodejs-foreach-2.0.5-1.fc23.src.rpm
successfully connected to hub
Uploading srpm: rpm/SRPMS/nodejs-foreach-2.0.5-1.fc23.src.rpm
2015-10-22 21:46:00,215 [DEBUG] koji: Fast upload: rpm/SRPMS/nodejs-foreach-2.0.5-1.fc23.src.rpm to cli-build/1445546759.859138.McGduCNV/nodejs-foreach-2.0.5-1.fc23.src.rpm
2015-10-22 21:46:00,929 [DEBUG] koji: Fast upload: rpm/SRPMS/nodejs-foreach-2.0.5-1.fc23.src.rpm complete. 9862 bytes in 0.4 seconds

Created task: 11546927
Task info: http://koji.fedoraproject.org/koji/taskinfo?taskID=11546927
Watching tasks (this may be safely interrupted)...
11546927 build (rawhide, nodejs-foreach-2.0.5-1.fc23.src.rpm): free
Traceback (most recent call last):
  File "/usr/bin/koji", line 6655, in <module>
    rv = locals()[command].__call__(options, session, args)
  File "/usr/bin/koji", line 952, in handle_build
    return watch_tasks(session, [task_id], quiet=build_opts.quiet)
  File "/usr/bin/koji", line 456, in watch_tasks
    changed = task.update()
  File "/usr/bin/koji", line 361, in update
    self.info = self.session.getTaskInfo(self.id, request=True)
  File "/usr/lib/python2.7/site-packages/koji/__init__.py", line 1577, in __call__
    return self.__func(self.__name,args,opts)
  File "/usr/lib/python2.7/site-packages/koji/__init__.py", line 1952, in _callMethod
    iter(arg)
TypeError: 'int' object is not iterable