plainbox run --non-interactive crashes

This crashes for me:

stubbox run -i '.*::stub/.*' -x '.*::stub/win32' -f xlsx -o test.xlsx -p with-sys-info,with-summary,with-job-description,with-text-attachments,with-unit-categories --non-interactive

With the following backtrace:

Traceback (most recent call last):
  File "/home/zyga/checkbox.here/venv/bin/stubbox", line 9, in <module>
    load_entry_point('plainbox==0.18.dev', 'console_scripts', 'stubbox')()
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/box.py", line 135, in stubbox_main
    raise SystemExit(StubBoxTool().main(argv))
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/clitools.py", line 304, in main
    return self.dispatch_and_catch_exceptions(ns)
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/clitools.py", line 529, in dispatch_and_catch_exceptions
    return self.dispatch_command(ns)
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/clitools.py", line 525, in dispatch_command
    return ns.command.invoked(ns)
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/cmd_run.py", line 45, in invoked
    self.provider_loader, self.config_loader, ns, ns.color).run()
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/inv_run.py", line 349, in run
    return self.do_normal_sequence()
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/inv_run.py", line 391, in do_normal_sequence
    self.run_all_selected_jobs()
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/inv_run.py", line 706, in run_all_selected_jobs
    self.run_single_job(job)
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/inv_run.py", line 710, in run_single_job
    self.run_single_job_with_ui(job, self.get_ui_for_job(job))
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/inv_run.py", line 729, in run_single_job_with_ui
    job_result = self._run_single_job_with_ui_loop(job, ui)
  File "/home/zyga/checkbox.here/plainbox/plainbox/impl/commands/inv_run.py", line 784, in _run_single_job_with_ui_loop
    return job_result
UnboundLocalError: local variable 'job_result' referenced before assignment