diff --git a/gtk2_ardour/monitor_section.cc b/gtk2_ardour/monitor_section.cc
index 59c987d429..5a09311d26 100644
--- a/gtk2_ardour/monitor_section.cc
+++ b/gtk2_ardour/monitor_section.cc
@@ -1333,7 +1333,7 @@ MonitorSection::output_button_resized (Gtk::Allocation& alloc)
 void
 MonitorSection::update_output_display ()
 {
-	if (!_route || !_monitor) {
+	if (!_route || !_monitor || _session->deletion_in_progress()) {
 		return;
 	}