import ldap.ldapobject
import pickle

lo = ldap.ldapobject.ReconnectLDAPObject('')
pickle.dumps(lo)

Traceback (most recent call last):
  File "/home/git/python-ldap/p.py", line 5, in <module>
    pickle.dumps(lo)
  File "/usr/lib/python3/dist-packages/ldap/ldapobject.py", line 880, in __getstate__
    state['_last_bind'] = self._last_bind[0].__name__, self._last_bind[1], self._last_bind[2]
                          ~~~~~~~~~~~~~~~^^^
TypeError: 'NoneType' object is not subscriptable