diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 81d8196a9f1d..6d8989482ade 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -93,12 +93,13 @@ static inline unsigned get_usb_high_speed_rate(unsigned int rate)
  */
 static void release_urb_ctx(struct snd_urb_ctx *u)
 {
-	if (u->buffer_size)
+	if (u->urb && u->buffer_size)
 		usb_free_coherent(u->ep->chip->dev, u->buffer_size,
 				  u->urb->transfer_buffer,
 				  u->urb->transfer_dma);
 	usb_free_urb(u->urb);
 	u->urb = NULL;
+	u->buffer_size = 0;
 }
 
 static const char *usb_error_string(int err)