Steps to reproduce:
1. Go to Control Panel > system settings > Form Navigator Configuration > Add entry
Form Navigator ID : journal.form
Form Navigator Entry Keys : content,schedule
2. Go to Site Administration/Content/Web Content/Add/Basic Web Content.
3. Fill in the fields and click Publish.
Result: You get a "Your request failed to complete" on the UI, and no error in the logs.
Expected: Article successfully saved