Segmentation fault with `kadmin.init_with_keytab(None)`

[alexdutton]

Python 3.5.3 (default, May 11 2017, 09:10:41)
[GCC 6.3.1 20161221 (Red Hat 6.3.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.

import kadmin
kadmin.init_with_keytab(None)
Segmentation fault (core dumped)

I haven't worked out why yet, but I'll see what I can work out.