const correctness.

[ardour.git] / libs / ardour / midi_region.cc

diff --git a/libs/ardour/midi_region.cc b/libs/ardour/midi_region.cc
index aad4bdfc678c210ac504e8a46b61d8aad21f6088..c65758b01e315867b6a5bbf6ba9864f8a0637427 100644 (file)
--- a/libs/ardour/midi_region.cc
+++ b/libs/ardour/midi_region.cc
@@ -272,6 +272,10 @@ MidiRegion::switch_source(boost::shared_ptr<Source> src)
 void
 MidiRegion::model_changed ()
 {
+       if (!model()) {
+               return;
+       }
+       
        /* build list of filtered Parameters, being those whose automation state is not `Play' */
 
        _filtered_parameters.clear ();