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ValueError: Circular reference detected

Wenn man die Inhaltsansicht, bemerkt bei ManuscriptWorks, öffnen möchte, lädt diese nicht und im Log wird folgender Fehler geworfen:

2024-06-14 10:48:47,784 ERROR   [Zope.SiteErrorLog:252][waitress-2] 1718354927.78310250.888460874531275 https://memo.saw-leipzig.de/api/@@getVocabulary
Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 162, in transaction_pubevents
  Module ZPublisher.WSGIPublisher, line 371, in publish_module
  Module ZPublisher.WSGIPublisher, line 266, in publish
  Module ZPublisher.mapply, line 85, in mapply
  Module ZPublisher.WSGIPublisher, line 63, in call_object
  Module plone.app.content.browser.vocabulary, line 286, in __call__
  Module plone.app.content.utils, line 24, in json_dumps
  Module simplejson, line 398, in dumps
  Module simplejson.encoder, line 296, in encode
  Module simplejson.encoder, line 378, in iterencode
ValueError: Circular reference detected