From 52f88f68145fb07a9f30eacbb5d2ea7f08a5ccde Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 20 Feb 2020 01:17:23 +0100
Subject: [PATCH] Fix crash on buffer override of N/A data-types

DiskReader::refill_audio and DR::run() do check if a given playlist
is available. This is required for upcoming changes to set
DR channels to unconditionally match DiskWriter.
---
 libs/ardour/disk_reader.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/disk_reader.cc b/libs/ardour/disk_reader.cc
index 00cc9163b2..ac07f23306 100644
--- a/libs/ardour/disk_reader.cc
+++ b/libs/ardour/disk_reader.cc
@@ -717,13 +717,13 @@ DiskReader::overwrite_existing_buffers ()
 	bool ret = true;
 
 	if (g_atomic_int_get (&_pending_overwrite) & (PlaylistModified|LoopDisabled|LoopChanged|PlaylistChanged)) {
-		if (!overwrite_existing_audio ()) {
+		if (_playlists[DataType::AUDIO] && !overwrite_existing_audio ()) {
 			ret = false;
 		}
 	}
 
 	if (g_atomic_int_get (&_pending_overwrite) & (PlaylistModified|PlaylistChanged)) {
-		if (!overwrite_existing_midi ()) {
+		if (_playlists[DataType::MIDI] && !overwrite_existing_midi ()) {
 			ret = false;
 		}
 	}