From f6c9fa4d89ee8b5445b5e60b2ce114632bd8d4af Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sat, 14 Dec 2013 10:35:18 -0500
Subject: [PATCH] fix a crash caused by not checking if
 MackieControlProtocol::_surfaces_state exists

I forgot to add this check when i changed the member variable to a pointer.
---
 libs/surfaces/mackie/mackie_control_protocol.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/surfaces/mackie/mackie_control_protocol.cc b/libs/surfaces/mackie/mackie_control_protocol.cc
index 9711f5dfc2..b2cdae334f 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.cc
+++ b/libs/surfaces/mackie/mackie_control_protocol.cc
@@ -668,7 +668,9 @@ MackieControlProtocol::create_surfaces ()
 			return -1;
 		}
 
-		surface->set_state (*_surfaces_state, _surfaces_version);
+		if (_surfaces_state) {
+			surface->set_state (*_surfaces_state, _surfaces_version);
+		}
 
 		{
 			Glib::Threads::Mutex::Lock lm (surfaces_lock);