AttributeError: 'NoneType' object has no attribute 'date ...
github.com › plone › ploneOct 17, 2015 · Therefore you need this IObjectCreatedEvent or IObjectModifiedEvent thrown with your event object as parameter, done with zope.event.notify. (this is an ugly hack and is not needed anymore in plone.app.event 2.0) So, I'd check if that event is thrown. For already imported events you might need an upgrade, which sets the timezone.