Unable to translate a Landing Page

It's not possible to translate a Landing Page.

Setup:

• add a new Language: Polish (pol-PL) and add it to admin_group in ezplatform.yaml

Steps to reproduce:
1. Login as admin
2. Go to Site -> Site Factory -> "site" Site
3. When previewing the "Home" Landing Page click "Add translation"
4. Select the language "Polish" and base it on English version
5. Click "Create'

Expected:
The Page Builder opens and allows me to translate the Landing Page

Actual:
Exception:

None of the chained routers were able to generate route: Route '' not found