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-rw-r--r--libs/midi++2/port.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/libs/midi++2/port.cc b/libs/midi++2/port.cc
index fa052ef33c..600886a94d 100644
--- a/libs/midi++2/port.cc
+++ b/libs/midi++2/port.cc
@@ -173,6 +173,8 @@ Port::clock (timestamp_t timestamp)
void
Port::cycle_start (nframes_t nframes)
{
+ assert (_jack_port);
+
_currently_in_cycle = true;
_nframes_this_cycle = nframes;