diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 1aa5d20a5d998d8d4511cae37d24620128f10474..8e2d6dd9add04678149ed605a21de3513a29ab0f 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -513,7 +513,8 @@ static void visor_read_bulk_callback(struct urb *urb)
 			tty_kref_put(tty);
 		}
 		spin_lock(&priv->lock);
-		priv->bytes_in += available_room;
+		if (tty)
+			priv->bytes_in += available_room;
 
 	} else {
 		spin_lock(&priv->lock);