Mitmdump crashes and freezes

Steps to reproduce the problem:

1.run mitmdump with my python script, the script is to intercept an android app video packets
2.it automatically downloading, sometimes, maybe in 10 mins, maybe in 20mins, there is no http flow
3.then when I Ctrl+C, there is no response, I have to continue press Ctrl+C to end the program. Then I got many “mitmproxy has crashed!” message in the command line

Any other comments? What have you tried so far?

here is the message after last avaliable http:

192.168.168.180:47697: Error in HTTP connection: HttpException(‘Unexpected EOF’)
192.168.168.180:47697: clientdisconnect
192.168.168.180:48371: clientconnect
192.168.168.180:56111: clientconnect
::ffff:192.168.168.180:38581: Ping Received from client
-> ping
::ffff:192.168.168.180:38581: Pong Received from server
->
192.168.168.180:36381: Error in HTTP connection: HttpException(‘Unexpected EOF’)
192.168.168.180:36381: clientdisconnect
192.168.168.180:55677: Error in HTTP connection: HttpException(‘Unexpected EOF’)
192.168.168.180:55677: clientdisconnect
192.168.168.180:45515: Error in HTTP connection: HttpException(‘Unexpected EOF’)
192.168.168.180:45515: clientdisconnect
192.168.168.180:38559: clientconnect
192.168.168.180:56262: Error in HTTP connection: HttpException(‘Unexpected EOF’)
192.168.168.180:56262: clientdisconnect
192.168.168.180:48222: Error in HTTP connection: HttpException(‘Unexpected EOF’)
192.168.168.180:48222: clientdisconnect
192.168.168.180:36641: Error in HTTP connection: HttpException(‘Unexpected EOF’)

Here is the repeating message that was stuck then appeared after I force quit the program (Ctrl+C)

Traceback (most recent call last):
File “e:\python37\lib\site-packages\mitmproxy\proxy\server.py”, line 121, in handle
root_layer()
File “e:\python37\lib\site-packages\mitmproxy\proxy\modes\http_proxy.py”, line 9, in call
layer()
TypeError: ‘NoneType’ object is not callable
mitmproxy has crashed!
192.168.168.180:49942: Error in HTTP connection: HttpException(‘Unexpected EOF’)Traceback (most recent call last):
File “e:\python37\lib\site-packages\mitmproxy\proxy\server.py”, line 121, in handle
root_layer()
File “e:\python37\lib\site-packages\mitmproxy\proxy\modes\http_proxy.py”, line 9, in call
layer()
TypeError: ‘NoneType’ object is not callable

System information

Mitmproxy: 4.0.4
Python: 3.7.0
OpenSSL: OpenSSL 1.1.0i 14 Aug 2018
Platform: Windows-10-10.0.16299-SP0