NameError: name 'shutdown' is not defined

Hello to the community,

I have run the new installed plone site smoothly.
When I want to restart plone in @@maintenance-controlpanel
error raised as follow:
Traceback (innermost last):
Module ZPublisher.WSGIPublisher, line 162, in transaction_pubevents
Module ZPublisher.WSGIPublisher, line 359, in publish_module
Module ZPublisher.WSGIPublisher, line 262, in publish
Module ZPublisher.mapply, line 85, in mapply
Module ZPublisher.WSGIPublisher, line 63, in call_object
Module z3c.form.form, line 233, in call
Module plone.z3cform.fieldsets.extensible, line 65, in update
Module plone.z3cform.patch, line 30, in GroupForm_update
Module, line 145, in update
Module, line 22, in execute
Module z3c.form.action, line 98, in execute
Module z3c.form.button, line 315, in call
Module z3c.form.button, line 170, in call
Module Products.CMFPlone.controlpanel.browser.maintenance, line 115, in handle_restart_action
NameError: name 'shutdown' is not defined

Could you please help me to fix it?


Start/stop Plone from the command line

Clearly a bug in in Plone since this code section does not check for the LIFETIME flag.