From 635916bf7a6d801cea9e42825cb03331e3081ca7 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 17 Dec 2025 18:31:02 +0100
Subject: [PATCH] Fix crash when group becomes empty but has a subgroup

Session::route_removed_from_route_group() did not delete
the group when it had a subgroup associated with it.
This way it was possible to have an empty track-group that
resulted in various edge-case crashes/assert().
---
 libs/ardour/route_group.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libs/ardour/route_group.cc b/libs/ardour/route_group.cc
index b2e5df9852..3205154985 100644
--- a/libs/ardour/route_group.cc
+++ b/libs/ardour/route_group.cc
@@ -283,6 +283,7 @@ RouteGroup::remove (std::shared_ptr<Route> r)
 		}
 		routes->erase (i);
 		if (routes->empty()) {
+			_subgroup_bus.reset ();
 			group_master.reset ();
 			_group_master_number = -1;
 		}