Exception when doing pcap capture

[jcopenha]

I occasionally get the following traceback when capturing to pcap

Traceback (most recent call last):
  File "C:\Users\copewin\AppData\Local\Programs\Python\Python39\lib\site-packages\frida\core.py", line 450, in _on_message
    callback(message, data)
  File "C:\Users\copewin\AppData\Local\Programs\Python\Python39\lib\site-packages\hallucinate-1.0.0-py3.9.egg\hallucinate\handler.py", line 75, in handle
    self.handle_payload(p, self.script.post)
  File "C:\Users\copewin\AppData\Local\Programs\Python\Python39\lib\site-packages\hallucinate-1.0.0-py3.9.egg\hallucinate\handler.py", line 50, in handle_payload
    self.process_shutdown(p, rhandle)
  File "C:\Users\copewin\AppData\Local\Programs\Python\Python39\lib\site-packages\hallucinate-1.0.0-py3.9.egg\hallucinate\handler.py", line 41, in process_shutdown
    self.handler.shutdown(p)
  File "C:\Users\copewin\AppData\Local\Programs\Python\Python39\lib\site-packages\hallucinate-1.0.0-py3.9.egg\hallucinate\handlers\multi.py", line 45, in shutdown
    handler.shutdown(p, d)
  File "C:\Users\copewin\AppData\Local\Programs\Python\Python39\lib\site-packages\hallucinate-1.0.0-py3.9.egg\hallucinate\handlers\pcap.py", line 37, in shutdown
    self.fp.write(c.shutdown(time.time_ns()))
TypeError: a bytes-like object is required, not 'NoneType'

It appears that TCPState.shtudown is being called on a TCPState that has never had send called on it. so TCPState.shutdown returns nothing

https://github.com/SySS-Research/hallucinate/blob/main/hallucinate/pcap.py#L191

In my instance this is not being called on the default TCPState object created at https://github.com/SySS-Research/hallucinate/blob/main/hallucinate/handlers/pcap.py#L23 but on a valid connection. The application I'm using is hooking OpenSSL.