fix crash during session deletion as monitor section tries to update

diff --git a/gtk2_ardour/monitor_section.cc b/gtk2_ardour/monitor_section.cc
index 59c987d42928d8374e43e7380fc4b7b0e0dfa3c8..5a09311d262c0e9f9e1537e8774d157d3aeee9d6 100644 (file)
--- 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;
        }