command line tool: KeyError when specifying Windows COM port with -p switch

Environment

Windows 10 64 bit, Python 3.7.3 64 bit. Two connected RSS2I devices.

rss2i -a getid

returns

rss2i: Detecting connected devices... [10, 3]
Device 10 Hardware Rev. B; onb. antenna Firmware v1.0.0 @ COM3
Device 03 Hardware Rev. B; onb. antenna Firmware v1.0.0 @ COM4
rss2i: Disconnecting devices...ok

Reproduce

Run

rss2i -p COM4 getid

analogous to the above situation.

Actual Result

[3]
rss2i: Disconnecting devices...ok
Traceback (most recent call last):
  File "C:\Python\Scripts\rss2i.py", line 2333, in <module>
    main()
  File "C:\Python\Scripts\rss2i.py", line 2316, in main
    args.func(args)
  File "C:\Python\Scripts\rss2i.py", line 722, in get_id
    response[4], _openSerialAddresses[devID]))
KeyError: 3

Expected result

[3]
Device 03 Hardware Rev. B; onb. antenna Firmware v1.0.0 @ COM4
rss2i: Disconnecting devices...ok