From 8cf1aaf40ff64a0729784d57ffbc51f0692cfacf Mon Sep 17 00:00:00 2001
From: Anders Jonsson <anders.jonsson@norsjovallen.se>
Date: Thu, 24 Oct 2024 18:17:18 +0200
Subject: [PATCH] Issue #12216: fix crash on switch to MWM

Since commit 4e499810, GIMP could crash on switching to
multi-window mode on X11 Linux systems.

As suggested by Alx Sa it is enough to add a NULL check for
shell to avoid the crash.
---
 app/display/gimpdisplay-foreach.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/display/gimpdisplay-foreach.c b/app/display/gimpdisplay-foreach.c
index 6675e85d1d..0039b0c27a 100644
--- a/app/display/gimpdisplay-foreach.c
+++ b/app/display/gimpdisplay-foreach.c
@@ -336,7 +336,7 @@ gimp_displays_accept_focus_events (Gimp *gimp)
     {
       GimpDisplayShell *shell = gimp_image_window_get_active_shell (iter->data);
 
-      if (! gimp_display_shell_is_drawn (shell))
+      if (shell && ! gimp_display_shell_is_drawn (shell))
         {
           accept = FALSE;
           break;