Merged branches are not deleting

Summary

Merged branches are not deleting

Steps to reproduce

Goto https://gitlab.com/yoginth/gitlab-ce/branches Click Delete merged branches button Wait for sometime The result is attached below

Example Project

https://gitlab.com/yoginth/gitlab-ce

What is the current bug behavior?

Meged braches are not deleting

What is the expected correct behavior?

Meged braches should delete after clicking the delete button

Relevant logs and/or screenshots

After deleting the merged branches

Original	Forked

Output of checks

This bug happens on GitLab.com