diff --git a/libs/ardour/midi_region.cc b/libs/ardour/midi_region.cc
index aad4bdfc67..c65758b01e 100644
--- 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 ();
diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index bf038326d5..5fef5f74a6 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -388,7 +388,10 @@ SMFSource::mark_streaming_write_completed ()
 		return;
 	}
 
-	_model->set_edited(false);
+	if (_model) {
+		_model->set_edited(false);
+	}
+	
 	Evoral::SMF::end_write ();
 }