diff --git a/sys/dev/sound/midi/midi.c b/sys/dev/sound/midi/midi.c
--- a/sys/dev/sound/midi/midi.c
+++ b/sys/dev/sound/midi/midi.c
@@ -184,8 +184,10 @@
 	MPU_UNINIT(m, m->cookie);
 	destroy_dev(m->dev);
 	free_unr(midi_unr, m->unit);
-	free(MIDIQ_BUF(m->inq), M_MIDI);
-	free(MIDIQ_BUF(m->outq), M_MIDI);
+	if (MIDIQ_BUF(m->inq))
+		free(MIDIQ_BUF(m->inq), M_MIDI);
+	if (MIDIQ_BUF(m->outq))
+		free(MIDIQ_BUF(m->outq), M_MIDI);
 	mtx_destroy(&m->lock);
 	free(m, M_MIDI);