From 104fafbdc2b784639fd8bb653d12242bbd10d48e Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 14 Apr 2016 19:20:39 +0200
Subject: fix odd case where a deliver has no ports e.g session load.

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

diff --git a/libs/ardour/delivery.cc b/libs/ardour/delivery.cc
index b31802e894..c538f6be8a 100644
--- a/libs/ardour/delivery.cc
+++ b/libs/ardour/delivery.cc
@@ -236,6 +236,10 @@ Delivery::run (BufferSet& bufs, framepos_t start_frame, framepos_t end_frame, pf
 	PortSet& ports (_output->ports());
 	gain_t tgain;
 
+	if (ports.num_ports () == 0) {
+		goto out;
+	}
+
 	if (!_active && !_pending_active) {
 		_output->silence (nframes);
 		goto out;
-- 
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