samba - Jun 2017 - Unable to delete a non-leaf node (it has 4 children)

I’m having issues removing an old dead DC.  I’m using the tool as follows:

sudo samba-tool domain demote --remove-other-dead-server=OLD-SERVER-NAME

I’m receiving the following error when it comes to deleting the machine:

ERROR(ldb): uncaught exception - subtree_delete: Unable to delete a non-leaf
node (it has 4 children)!
  File
"/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/__init__.py",
line 176, in _run
    return self.run(*args, **kwargs)
  File
"/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/domain.py",
line 730, in run
    remove_dc.remove_dc(samdb, logger, remove_other_dead_server)
  File
"/usr/local/samba/lib/python2.7/site-packages/samba/remove_dc.py",
line 412, in remove_dc
    remove_dns_account=True)
  File
"/usr/local/samba/lib/python2.7/site-packages/samba/remove_dc.py",
line 229, in offline_remove_server
    samdb.delete(server_dn)

Is that any way to force this delete?

Thanks
Danny