This is upstream bug 502969 and was fixed in version 13.7. It was due to a bug in the valac compiler.
https://bugs.launchpad.net/debian/+source/deja-dup/+bug/502969 -mt -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
