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-rw-r--r--libs/ardour/delivery.cc4
1 files changed, 4 insertions, 0 deletions
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;