From caae3501ec6531e736346e46e74fb323600175f3 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 13 May 2024 23:11:27 +0200
Subject: [PATCH] TransportMasterWidget may not have a session

Other parts in this dialog already test for session == nullptr.
This can happen in the Preferences, when switching a timecode
master w/o a session (not possible in Ardour, but some derivative
project).
---
 gtk2_ardour/transport_masters_dialog.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/transport_masters_dialog.cc b/gtk2_ardour/transport_masters_dialog.cc
index 1c932ef9f8..0b2d1c4a81 100644
--- a/gtk2_ardour/transport_masters_dialog.cc
+++ b/gtk2_ardour/transport_masters_dialog.cc
@@ -124,7 +124,9 @@ TransportMastersWidget::~TransportMastersWidget ()
 void
 TransportMastersWidget::set_transport_master (std::shared_ptr<TransportMaster> tm)
 {
-	_session->request_sync_source (tm);
+	if (_session) {
+		_session->request_sync_source (tm);
+	}
 }
 
 void