From 22eee12f556a9f749bf6645abd988212a524ad26 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 29 Dec 2025 09:56:42 +0100
Subject: [PATCH] Fix crash when changing aux-panner state #10077

MixerStrip::show_send() may unset _panner if the send
has no panner. When then triggering an action that emits
`Pannable::automation_state_changed` (like un/link send panners)
of the main panner, Ardour crashed.

Note that PannerUI::set_panner already handed that case.
---
 gtk2_ardour/panner_ui.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gtk2_ardour/panner_ui.cc b/gtk2_ardour/panner_ui.cc
index 45b1872c63..7cc781b687 100644
--- a/gtk2_ardour/panner_ui.cc
+++ b/gtk2_ardour/panner_ui.cc
@@ -540,6 +540,9 @@ PannerUI::pan_automation_state_button_event (GdkEventButton *ev)
 void
 PannerUI::pan_automation_state_changed ()
 {
+	if (!_panner) {
+		return;
+	}
 	std::shared_ptr<Pannable> pannable (_panner->pannable());
 	pan_automation_state_button.set_label (GainMeterBase::short_astate_string(pannable->automation_state()));