Cannot add song to queue because of scanFolder failure

Trying to add song using the websocket API, the UI confirm that the song is received but do not play.

Looking at the log, I discover that once the song is received, volumio is doing a scanFolder which failed:

Jun 20 12:48:17 volumio2 volumio[917]: info: CorePlayQueue::addQueueItems
Jun 20 12:48:17 volumio2 volumio[917]: info: Adding Item to queue: 192/168.0.104/sons/qualif/al395.mp3
Jun 20 12:48:17 volumio2 volumio[917]: info: Exploding uri 192/168.0.104/sons/qualif/al395.mp3 in service mpd
Jun 20 12:48:17 volumio2 volumio[917]: scanFolder - failure to stat ‘/mnt/192/168.0.104/sons/qualif/al395.mp3’

Is it possible to deactive scanFolder function ?