From f519edbe8e3196be8cf26f97119715618d123b52 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 20 Feb 2016 20:24:03 +0100
Subject: [PATCH] fix segfault in libardour unit-tests (possible crash in
 mackie sf)

---
 libs/surfaces/mackie/surface.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/surfaces/mackie/surface.cc b/libs/surfaces/mackie/surface.cc
index 274f2b42ea..6941c68d29 100644
--- a/libs/surfaces/mackie/surface.cc
+++ b/libs/surfaces/mackie/surface.cc
@@ -384,7 +384,9 @@ Surface::setup_master ()
 	}
 
 	if (!m) {
-		_master_fader->set_control (boost::shared_ptr<AutomationControl>());
+		if (_master_fader) {
+			_master_fader->set_control (boost::shared_ptr<AutomationControl>());
+		}
 		master_connection.disconnect ();
 		return;
 	}