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-rw-r--r--libs/ardour/midi_diskstream.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/midi_diskstream.cc b/libs/ardour/midi_diskstream.cc
index 2e1647f507..6efa1abbae 100644
--- a/libs/ardour/midi_diskstream.cc
+++ b/libs/ardour/midi_diskstream.cc
@@ -549,6 +549,7 @@ MidiDiskstream::process (nframes_t transport_frame, nframes_t nframes, nframes_t
for (size_t i=0; i < to_write; ++i) {
const MIDI::Event& ev = *port_iter;
+ assert(ev.buffer());
_capture_buf->write(ev.time() + transport_frame, ev.size(), ev.buffer());
++port_iter;
}