From 96cbcf0ee49b0f21f9953ca1ec6c3eab851c72ef Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Fri, 17 Jan 2014 19:34:51 -0500
Subject: [PATCH] Fix crash when instrument plugins fail to instantiate.

---
 libs/ardour/plugin_insert.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index 10368bfb42..f2689bf998 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -719,6 +719,10 @@ PluginInsert::can_support_io_configuration (const ChanCount& in, ChanCount& out)
 PluginInsert::Match
 PluginInsert::private_can_support_io_configuration (ChanCount const & inx, ChanCount& out)
 {
+	if (_plugins.empty()) {
+		return Match();
+	}
+
 	PluginInfoPtr info = _plugins.front()->get_info();
 	ChanCount in; in += inx;
 	midi_bypass.reset();