accessing project_members under impersonation url points to URL without /gitlab/ in path -> 404

As Admin when I impersonate user, open for example following URL with real project: http://server-name/gitlab/integration-platform/commons/common-archive-service

But when click on Members it tries to open: http://server-name/integration-platform/commons/common-archive-service/project_members

This leads to 404 Error as soon as the URL is missing /gitlab/ within its path.

I noticed that this issue doesn't occur when I click on Members from Group perspective, but only from Project perspective.