Rights error displayed to users that have admin right on specific spaces

[oanalavinia]

Prerequisites:
Have a user User1, which is not part of the XWikiAdminGroup group (so a simple user)
Give him admin rights on a specific space, e.g. Sandbox

Steps to reproduce:

1. Login with User1
2. Go to any page from the Sandbox space

Expected result:
No error is displayed

Actual result:
An error is displayed after the page header. This is not happening while outside of the space where User1 is admin