From 96b21c4824c5360b478daf04bf39f970c41a55a6 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sun, 5 Dec 2021 10:36:26 -0700
Subject: [PATCH] fix crash in Playlist::relayer() when there are no regions

---
 libs/ardour/playlist.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/ardour/playlist.cc b/libs/ardour/playlist.cc
index d9451e5ce1..cd5d16441e 100644
--- a/libs/ardour/playlist.cc
+++ b/libs/ardour/playlist.cc
@@ -2504,6 +2504,11 @@ Playlist::relayer ()
 		return;
 	}
 
+	if (regions.empty()) {
+		/* nothing to do */
+		return;
+	}
+
 	/* Build up a new list of regions on each layer, stored in a set of lists
 	 * each of which represent some period of time on some layer.  The idea
 	 * is to avoid having to search the entire region list to establish whether