Nocturn: Do not write to a missing USB device

diff --git a/nocturn.c b/nocturn.c
index ba5edf25f7e74693ad8952c9d5e304cf8bc01b29..158f1407df6f58e2915a8699f3d7e4390ce2e14b 100644 (file)
--- a/nocturn.c
+++ b/nocturn.c
@@ -270,7 +270,7 @@ static void noct_do_write(uint cmd, uint arg)
 
 static void noct_sched_write(void)
 {
 
 static void noct_sched_write(void)
 {

-  if (noct_write_pending)
+  if (!usb_dev || noct_write_pending)

     return;
 
   if (noct_dirty_button)
     return;
 
   if (noct_dirty_button)