get_arp_table() - failed to detect EUI version: 'Incomplete'

[vojtulan]

When trying to get_arp_table on CE switch:

'192.168.0.1' generated an exception: failed to detect EUI version: 'Incomplete'
Traceback (most recent call last):
  File "test.py", line 260, in <module>
    data = future.result()
  File "/usr/lib/python3.8/concurrent/futures/_base.py", line 437, in result
    return self.__get_result()
  File "/usr/lib/python3.8/concurrent/futures/_base.py", line 389, in __get_result
    raise self._exception
  File "/usr/lib/python3.8/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "test.py", line 84, in DeviceInfoFetchPipeline
    "arpTable" : connection.get_arp_table(),
  File "/home/altepro/.local/lib/python3.8/site-packages/napalm_ce/ce.py", line 678, in get_arp_table
    'mac': napalm.base.helpers.mac(arp[1]),
  File "/home/altepro/.local/lib/python3.8/site-packages/napalm/base/helpers.py", line 339, in mac
    return str(EUI(raw, dialect=_MACFormat))
  File "/home/altepro/.local/lib/python3.8/site-packages/netaddr/eui/__init__.py", line 389, in __init__
    self.value = addr
  File "/home/altepro/.local/lib/python3.8/site-packages/netaddr/eui/__init__.py", line 438, in _set_value
    raise AddrFormatError('failed to detect EUI version: %r'
netaddr.core.AddrFormatError: failed to detect EUI version: 'Incomplete'

On the switch:

<ce_switch>display arp
ARP Entry Types: D - Dynamic, S - Static, I - Interface, O - OpenFlow, RD - Redirect
EXP: Expire-time VLAN: VLAN or Bridge Domain

IP ADDRESS      MAC ADDRESS    EXP(M) TYPE/VLAN       INTERFACE        VPN-INSTANCE
----------------------------------------------------------------------------------------
172.21.21.220   3ce8-246b-f3a4        I               Vlanif100
172.21.21.254   3ce8-246b-f3a4        I               Vlanif100
172.21.21.15    2834-a2d3-0fd1    9   D/100           Eth-Trunk50
172.21.21.20    3ce8-2482-4fc4   18   D/100           Eth-Trunk50
172.21.21.50    2894-0f11-b341   13   D/100           10GE1/0/2
172.21.21.60    548a-ba54-db41   12   D/100           Eth-Trunk9
172.21.21.105   001d-e5c5-edc1   18   D/100           Eth-Trunk50
172.21.21.110   30fb-b88f-753b   19   D/100           Eth-Trunk6
172.21.21.180   c800-848f-ddba   17   D/100           Eth-Trunk50
172.21.21.181   c4b9-cd3e-da9a   19   D/100           10GE1/0/17
172.21.21.182   c4b9-cd3e-dc4d   20   D/100           10GE2/0/17
172.21.21.183   c4b9-cd3e-e4cc   16   D/100           Eth-Trunk6
172.21.21.184   0076-86b7-3d0d   18   D/100           Eth-Trunk9
172.21.21.200   0c68-0368-abd1   13   D/100           Eth-Trunk47
172.21.8.10     3ce8-246b-f3a3        I               Vlanif1
172.21.8.253    3ce8-246b-f3a3        I               Vlanif1
172.21.8.15     001d-a1d5-d640    6   D/1             Eth-Trunk47
172.21.8.16     2c3e-cfbf-aec0   14   D/1             Eth-Trunk47
172.21.8.30     000a-5900-c7a4   16   D/1             Eth-Trunk50
172.21.8.31     000a-5900-c79f   16   D/1             Eth-Trunk47
172.21.8.40     0005-336e-f6e4   18   D/1             Eth-Trunk50
172.21.8.43     00c0-ffdb-40de    8   D/1             Eth-Trunk50
172.21.8.44     00c0-ffd8-ef70    8   D/1             Eth-Trunk50
172.21.8.47     0027-f8c2-8f17   20   D/1             Eth-Trunk50
172.21.8.64     f8b1-56d5-e2ca   20   D/1             Eth-Trunk47
172.21.8.71     f01f-afd9-e81c    5   D/1             Eth-Trunk50
172.21.8.72     c81f-66c0-bf18    5   D/1             Eth-Trunk50
172.21.8.76     Incomplete        1   D               Vlanif1
.
.
.
172.21.7.245    Incomplete        1   D               Vlanif432
172.21.7.246    Incomplete        1   D               Vlanif432
172.21.7.247    Incomplete        1   D               Vlanif432
172.21.7.248    Incomplete        1   D               Vlanif432
172.21.7.249    Incomplete        1   D               Vlanif432
172.21.7.250    Incomplete        1   D               Vlanif432
172.21.7.251    Incomplete        1   D               Vlanif432
172.21.7.252    Incomplete        1   D               Vlanif432
172.21.7.253    Incomplete        1   D               Vlanif432
172.21.7.254    Incomplete        1   D               Vlanif432
172.25.26.250   3ce8-246b-f3aa        I               Vlanif526
172.25.26.253   40ce-2438-0db7    1   D/526           10GE1/0/14
172.25.26.254   0000-0c07-ac42   20   D/526           10GE1/0/14
172.19.16.254   3ce8-246b-f3aa        I               Vlanif568
172.19.16.1     0000-0c9f-f238    2   D/568           Eth-Trunk3
172.19.16.2     8c60-4f85-ed01    8   D/568           Eth-Trunk3
172.19.16.3     8c60-4f85-ed7c    5   D/568           Eth-Trunk3
172.19.15.14    3ce8-246b-f3ab        I               Vlanif569
----------------------------------------------------------------------------------------
Total:703         Dynamic:688       Static:0    Interface:15    OpenFlow:0
Redirect:0

Tried googling the problem but there was nothing.
Any one knows what this exception means ?