no Albumart-Link for Webradio from Api-Request

Sorry for my bad english…

When I call a webradioplaylist from the Api with:

volumio.local/api/v1/commands/?cmd=playplaylist&name=Rock

then the name of the url to the albumart-link is :

/albumart?cacheid=818

When I call a webradioplaylist from the UI, I see the Albumart in the list of playlists and the url is correct

http://cdn-profiles.tunein.com/s9214/images/logoq.png

Whats the error or the issue?