Summary() mod is not implemented in PacketList

[2xyo]

summary mod is not implemented :

{
  "cmd": "/bin/ping -c 10 www.example.com",

  "nfrules": [
    {"host": "www.example.com"}
  ],

  "input": [
  ],

  "output": [
    {
      "mod_name": "summary",
    }
  ]
}

Traceback (most recent call last):
  File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/home/user/Documents/Fragscapy/Fragscapy_venv/lib/python3.7/site-packages/fragscapy-1.1-py3.7.egg/fragscapy/engine.py", line 260, in run
    self._process_output(packet)
  File "/home/user/Documents/Fragscapy/Fragscapy_venv/lib/python3.7/site-packages/fragscapy-1.1-py3.7.egg/fragscapy/engine.py", line 228, in _process_output
    packetlist = self._output_modlist.apply(packetlist)
  File "/home/user/Documents/Fragscapy/Fragscapy_venv/lib/python3.7/site-packages/fragscapy-1.1-py3.7.egg/fragscapy/modlist.py", line 57, in apply
    pkt_list = mod.apply(pkt_list)
  File "/home/user/Documents/Fragscapy/Fragscapy_venv/lib/python3.7/site-packages/fragscapy-1.1-py3.7.egg/fragscapy/modifications/summary.py", line 31, in apply
    pkt_list.summary()
AttributeError: 'PacketList' object has no attribute 'summary'