Error in skin helper service

I have the default OSMC skin and the addon artwork downloader. Today I have this error in the kodi.log:
22:20:27.443 T:1695544064 WARNING: Skin Helper Service --> Traceback (most recent call last):
File “/home/osmc/.kodi/addons/”, line 53,
in onNotification
self.process_db_update(mediatype, dbid, transaction)
File “/home/osmc/.kodi/addons/”, line 107,
in process_db_update
song[“disc”]), ignore_cache=True, flush_cache=True)
File “/home/osmc/.kodi/addons/script.module.metadatautils/lib/”, line 92, in get_m
artist, album, track, disc, ignore_cache=ignore_cache, flush_cache=flush_cache)
File “/home/osmc/.kodi/addons/script.module.metadatautils/lib/helpers/”, line 51, i
n get_music_artwork
ignore_cache=ignore_cache, flush_cache=flush_cache, manual=manual)
File “/home/osmc/.kodi/addons/script.module.metadatautils/lib/helpers/”, line 126,
in get_artists_metadata
art += feat_artist_details[“art”].get(arttype, )
TypeError: cannot concatenate ‘str’ and ‘list’ objects
22:20:27.444 T:1695544064 ERROR: Skin Helper Service --> Exception in resources.lib.kodi_monitor ! --> cannot concatenate ‘str’ and ‘list’ obj

How to fix it or is there nothing to do?