[knot-dns-users] predict.lua error

Hello, all When using knot DNS resolver, the following error was output. Feb 06 20:19:43 dns02 kresd[24857]: error: /usr/lib/knot-resolver/predict.lua:34: 'struct rr_type' has no member named 'nil' $ kresd -V Knot DNS Resolver, version 1.2.1 $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description:    Ubuntu 16.04.1 LTS Release:        16.04 Codename:       xenial Is it related to setting reorder_RR (true)? Is this a configuration issue in this case? Or is it a known bug? Thanks.