Error processing request on tvdb: {'invalidQueryParams': ['lang']}

Kept getting issues when filling in series info from tvdb. After activating debug mode the following is shown:

2020-10-15 10:04 DEBUG    entry_list.db fill-series-list adding entry <Entry(title=Samurai Jack (2001),state=accepted)> to list trakt-series
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Looking up tvdb information for 'Samurai Jack (2001)'. TVDB ID: 75164
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Series <name=Samurai Jack (2001),tvdb_id=75164> information restored from cache.
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Looking up tvdb information for 'Samurai Jack (2001)'. TVDB ID: 75164
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Series <name=Samurai Jack (2001),tvdb_id=75164> information restored from cache.
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Looking up tvdb information for 'Samurai Jack (2001)'. TVDB ID: 75164
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Series <name=Samurai Jack (2001),tvdb_id=75164> information restored from cache.
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list Getting top 5 posters for series Samurai Jack
2020-10-15 10:04 DEBUG    utils.requests fill-series-list GETing URL https://api.thetvdb.com/series/75164/images/query with args () and kwargs {'params': {'keyType': 'poster'}, 'headers': {'Accept-Language': 'en', 'Authorization': 'Bearer <redacted>'}, 'json': None, 'timeout': 30}
2020-10-15 10:04 DEBUG    api_tvdb      fill-series-list **Result contains errors: {'invalidQueryParams': ['lang']}**
2020-10-15 10:04 DEBUG    thetvdb_lookup fill-series-list Error looking up tvdb series information for Samurai Jack (2001): Error processing request on tvdb: {'invalidQueryParams': ['lang']}

My current Flexget version is: 2.20.27

Looking at the changelog i see the following:

2.21.8 (2019-06-11)

all commits

Added

  • thetvdb_list: Add ‘language’ option

Is it possible to upgrade from 2.20.7 to 2.21.8 only?