LDAP user lost admin privilege

I’m using omnibus GitLab 7.8.4 019ffd9 on CentOS x64 6.5 which is running on a ESXI host.

After I set a ldap user to administrator, I blocked the old ‘Standard’ root user.

I migrate the virtual machine to a new ESXI host the other day, and I found out my new admin(ldap user) privilege is lost, now I have no idea how exactly I can get my privilege back?