TypeError in fs plugin

[mtbc]

$ omero fs usage --report --human-readable ExperimenterGroup:4
Using session for user-6@localhost:4064. Idle timeout: 10 min. Current group: private-1
Total disk usage: 889.8 MB bytes in 341 files
Traceback (most recent call last):
  File "/tmp/omero/bin/omero", line 118, in <module>
    rv = omero.cli.argv()
  File "/tmp/omero/lib/python3.7/site-packages/omero/cli.py", line 1750, in argv
    cli.invoke(args[1:])
  File "/tmp/omero/lib/python3.7/site-packages/omero/cli.py", line 1188, in invoke
    stop = self.onecmd(line, previous_args)
  File "/tmp/omero/lib/python3.7/site-packages/omero/cli.py", line 1265, in onecmd
    self.execute(line, previous_args)
  File "/tmp/omero/lib/python3.7/site-packages/omero/cli.py", line 1347, in execute
    args.func(args)
  File "/tmp/omero/lib/python3.7/site-packages/omero/plugins/fs.py", line 884, in usage
    self._usage_report(req, rsp, status, args)
  File "/tmp/omero/lib/python3.7/site-packages/omero/plugins/fs.py", line 945, in _usage_report
    if args.report and not args.size_only and size > 0:
TypeError: '>' not supported between instances of 'str' and 'int'
$ python --version
Python 3.7.8
$