There has been a new upstream release 0.1.13 (made by myself) which includes previous nmu changes and fixes this bug.
However, I have for a period been busy at work and missed the transition from SHA1 to SHA256 signatures on the keys in the Debian keyring. I have upgraded my key and updated the Debian key server, but will be unable to do a maintainer upload until the upgraded key will become pushed into the active keyring. (Last push was December 26:th.) I'll try to find some way around this, but anyone is welcome to come up with advice.
