Retrieval error (TypeError: can't convert Hash to String)

[PRESFIL]

2020-12-27 02:41:28 (info) transmission-rss 1.2.0
2020-12-27 02:41:28 (debug) {"feeds"=>[{"url"=>"nyaa.si/?page=rss&u=pashok2801"}], "update_interval"=>600, "add_paused"=>false, "server"=>{"host"=>"localhost", "port"=>9091, "rpc_path"=>"/transmission/rpc"}, "login"=>nil, "log"=>{"target"=>:stderr, "level"=>"debug"}, "fork"=>false, "single"=>false, "pid_file"=>false, "privileges"=>{}, "seen_file"=>nil}
2020-12-27 02:41:28 (debug) no privilege dropping
2020-12-27 02:41:28 (debug) 0 uris from seenfile
2020-12-27 02:41:28 (debug) pid 37089
2020-12-27 02:41:28 (debug) aggregator start
2020-12-27 02:41:28 (debug) aggregate nyaa.si/?page=rss&u=pashok2801
/usr/lib/ruby/2.7.0/open-uri.rb:52: warning: The last argument is split into positional and keyword parameters
2020-12-27 02:41:28 (debug) retrieval error (TypeError: can't convert Hash to String (Hash#to_str gives NilClass))

---

ruby version: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
transmission-rss version: 1.2.0

Systemwide config:

feeds:
  - url: 'nyaa.si/?page=rss&u=pashok2801'

server:
  host: localhost
  port: 9091
  rpc_path: /transmission/rpc