From 73d559056eaeb789d08e558b982ff69c3841e495 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 14 Sep 2023 07:49:13 -0600
Subject: [PATCH] partial Route::set_state() calls with a MementoCommand should
 not reset processor state (#9434)

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

diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 912f03aa1d..ee7e29382d 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -3117,6 +3117,11 @@ void
 Route::set_processor_state (const XMLNode& node, int version)
 {
 	const XMLNodeList &nlist = node.children();
+
+	if (nlist.empty()) {
+		return;
+	}
+
 	XMLNodeConstIterator niter;
 	ProcessorList new_order;
 	bool must_configure = false;