[python3_support] int() argument must be a string, not '_collections._tuplegetter'

[cowbe0x004]

I'm getting this error,

CapTipper v0.3 b14 - Malicious HTTP traffic explorer tool
Copyright 2015 Omri Herscovici <omriher@gmail.com>

[A] Analyzing PCAP: ../../Downloads/pcap/2020-12-31-traffic-analysis-quiz-01.pcap
int() argument must be a string, a bytes-like object or a number, not '_collections._tuplegetter'

The pcap can be downloaded here https://www.malware-traffic-analysis.net/2020/12/31/2020-12-31-traffic-analysis-quiz-6-pcaps.zip, specifically 2020-12-31-traffic-analysis-quiz-01.pcap. Any idea how to solve this? I'm running python 3.9.2.