From aeefd7e50a26d0d73d84dc4cd2245f0da2dc66bb Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 18 Dec 2019 15:05:35 -0700
Subject: fix crash when looping with a MIDI track

---
 libs/ardour/disk_reader.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/disk_reader.cc b/libs/ardour/disk_reader.cc
index b7ac8dbfc9..700a058392 100644
--- a/libs/ardour/disk_reader.cc
+++ b/libs/ardour/disk_reader.cc
@@ -1662,11 +1662,16 @@ DiskReader::reload_loop ()
 		return;
 	}
 
+	boost::shared_ptr<ChannelList> c = channels.reader();
+
+	if (c->empty() || !_playlists[DataType::MIDI]) {
+		return;
+	}
+
 	Location* loc = _loop_location;
 	boost::scoped_array<Sample> mix_buf (new Sample [loop_fade_length]);
 	boost::scoped_array<Sample> gain_buf (new Sample [loop_fade_length]);
 
-	boost::shared_ptr<ChannelList> c = channels.reader();
 	uint32_t channel = 0;
 
 	for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan, ++channel) {
-- 
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