Fix "unpack requires a buffer of 1 bytes" bug

4 jobs for passoft_py3_bugs in 42 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed linting #2516
passoft

00:00:42

passed python3.6 #2517
passoft

00:00:33

passed python3.7 #2518
passoft

00:00:37

passed python3.8 #2519
passoft

00:00:31