Figure out warning about unknown error type when exporting .tpf file

I found this warning on an OnionPerf test instance:

2020-04-27 13:00:01 1587992401.168824 [onionperf] [INFO] saving analysis results to /home/cloud/onionperf-data/htdocs/op-nl2-51200-2020-04-27.tpf
2020-04-27 13:00:01 1587992401.169561 [onionperf] [WARNING] KeyError while exporting torperf file, missing key _PROXY_END_MISC_, skipping transfer 'transfer50k:2'
2020-04-27 13:00:01 1587992401.170384 [onionperf] [INFO] done!

I don't have time to look into this yet, but I'll attach log files to find out later.

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