setkey for HMAC results in IndexError

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Problem

When trying to write a HMAC initialization vector to the OnlyKey,
the CLI returns <class 'IndexError'> without further information.

Steps to reproduce

This issue occurs when following the example from the README (see here).

The exact CLI interaction is:

$ onlykey-cli
OnlyKey CLI v1.2.10
Control-D to exit.

OnlyKey> setkey HMAC1 h

Type Control-T to toggle password visible.
Password/Key: ****************************************
<class 'IndexError'>
Input error. See available commands with examples here https://docs.crp.to/command-line.html

Possible cause

The error appears to be thrown at only_key.setkey(slot_id, data[2], data[3], key),
because data[3] is not set by above-mentioned CLI command.
data[3] seems to be the value for features, which above-linked instructions for setting the HMAC key do not mention.

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thanks in advance for looking into this!