From 104da317ff6b90bf63323f63080e9b412904d180 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 31 Dec 2012 15:27:38 +0000
Subject: [PATCH] avoid crashing in a wierd case (possibly a race) in Mackie
 support

git-svn-id: svn://localhost/ardour2/branches/3.0@13749 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/surfaces/mackie/mackie_control_protocol.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/surfaces/mackie/mackie_control_protocol.cc b/libs/surfaces/mackie/mackie_control_protocol.cc
index 3791252ade..911d2e56aa 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.cc
+++ b/libs/surfaces/mackie/mackie_control_protocol.cc
@@ -524,6 +524,10 @@ MackieControlProtocol::update_surfaces()
 void
 MackieControlProtocol::initialize()
 {
+	if (surfaces.empty()) {
+		return;
+	}
+
 	if (!surfaces.front()->active ()) {
 		return;
 	}