Media player error in log

I get this error reggarding my Sonos all the time in the logs

17-04-29 23:06:08 WARNING (MainThread) [homeassistant.helpers.entity] Update for media_player.livingroom is already in progress
17-04-29 23:06:09 WARNING (MainThread) [homeassistant.helpers.entity] Update for media_player.kitchen is already in Progress

someone knows what it means?