Fail to associate users to a group in the Groups page

Use case

As an organization administer, it's no more possible to associate users to a group, the following error message is displayed :

"Either group id or couple organization/group name must be set"

Technical detail

The UI is executing the WS api/user_groups/users?id=<Group ID>&organization=<Organization key>, whereas it should execute api/user_groups/users?name=<Group ID>&organization=<Organization key>