500 API Error : Get GitLab CE branches with /projects/13083/repository/branches/

I try to get GitLab CE branches, but server returns 500 Error. https://gitlab.com/api/v4/projects/13083/repository/branches/

But i don't have those problems, when try to get GitFox branches. https://gitlab.com/api/v4/projects/2977308/repository/branches/