diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 7cba822c41..40b374512f 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -749,9 +749,6 @@ Session::destroy ()
 	delete _butler;
 	_butler = 0;
 
-	DEBUG_TRACE (DEBUG::Destruction, "delete route groups\n");
-	_route_groups.clear ();
-
 	if (click_data != default_click) {
 		delete [] click_data;
 	}
@@ -828,6 +825,9 @@ Session::destroy ()
 	}
 	routes.flush ();
 
+	DEBUG_TRACE (DEBUG::Destruction, "delete route groups\n");
+	_route_groups.clear ();
+
 	{
 		DEBUG_TRACE (DEBUG::Destruction, "delete sources\n");
 		Glib::Threads::Mutex::Lock lm (source_lock);