--hostname option broken

the command pakon-show -h nic.cz throws following error.

user@router:~# pakon-show -H google.com
Traceback (most recent call last):
  File "/usr/bin/pakon-show", line 133, in <module>
    data=json.loads(response)
  File "/usr/lib/python3.7/json/__init__.py", line 348, in loads
  File "/usr/lib/python3.7/json/decoder.py", line 337, in decode
  File "/usr/lib/python3.7/json/decoder.py", line 355, in raw_decode
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)