Description

Release of django-treebeard 4.5 seems introduce breacking change from django-cms.

IntegrityError at /en/admin/cms/page/add-plugin/

duplicate key value violates unique constraint "cms_cmsplugin_path_4917bb44_uniq"
DETAIL:  Key (path)=() already exists.

Steps to reproduce

Steps to reproduce the behavior:

1. Install a fresh django-cms or update your dependencies to have treebeard 4.5 installed
2. Create a page with no content
3. Publish it
4. Edit it then add a plugin
5. Save our plugin content
6. Then boom !

Expected behaviour

I should be able to add a plugin without error.

Actual behaviour

An error occured when I try to save a plugin.

Screenshots

Additional information (CMS/Python/Django versions)

Python: 3.6.11
Django-CMS: 3.8.0

I reproduced this error on a fresh install from Divio.

Quick workaround : Rollback to treebeard 4.4

We identify the following change as potential source of this issue. django-treebeard/django-treebeard#192