Try to krackattacks-poc-zerokey but doen not work properly

[Smith31]

Thank you this script.
I try to this script.Attacker Kali Linux be attacked Ubuntu 15.10 (wpa_supplicant 2.4)
I check disconnect real channel(1ch). And I check rogue channel(11ch).
Be attacked Client unconnected. After try to rogue channel but require password.
and end krackattacks-poc-zerokey.py I don't know why don't work properly.

[11:23:16] Rogue channel: xx:xx:xx:xx:xx:xx -> 00:00:00:00:00:00: ProbeResp(seq=1412)
[11:23:17] Rogue channel: 00:00:00:00:00:00 -> ff:ff:ff:ff:ff:ff: ProbeReq(seq=4082)
[11:23:17] Rogue channel: 00:00:00:00:00:00 -> ff:ff:ff:ff:ff:ff: ProbeReq(seq=4083)
[11:23:17] Rogue channel: injected Disassociation to 00:00:00:00:00:00
[11:23:17] Rogue channel: xx:xx:xx:xx:xx:xx -> 00:00:00:00:00:00: ProbeResp(seq=1413)
[11:23:17] Rogue channel: xx:xx:xx:xx:xx:xx -> 00:00:00:00:00:00: ProbeResp(seq=1414)
Traceback (most recent call last):
File "./krack-all-zero-tk.py", line 1018, in
attack.run(strict_echo_test=args.strict_echo_test)
File "./krack-all-zero-tk.py", line 950, in run
if self.sock_rogue in sel[0]: self.handle_rx_roguechan()
File "./krack-all-zero-tk.py", line 760, in handle_rx_roguechan
if Dot11Beacon in p and ord(get_tlv_value(p, IEEE_TLV_TYPE_CHANNEL)) == self.netconfig.rogue_channel:
TypeError: ord() expected string of length 1, but NoneType found
[11:23:17] Closing hostapd and cleaning up ...