From 8e0b043f49a014d1e3f45bd82917c31aa4181951 Mon Sep 17 00:00:00 2001
From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Sat, 12 Feb 2022 17:47:21 -0500
Subject: [PATCH] * src/xterm.c (x_update_opaque_region): Avoid crash at
 startup in Lucid build

---
 src/xterm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/xterm.c b/src/xterm.c
index 7195311737f..e107c65aa2d 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -451,7 +451,7 @@ x_update_opaque_region (struct frame *f, XEvent *configure)
 				    : FRAME_PIXEL_HEIGHT (f))};
 #endif
 
-  if (!FRAME_DISPLAY_INFO (f)->alpha_bits)
+  if (!(f && FRAME_DISPLAY_INFO (f)->alpha_bits))
     return;
 
   block_input ();
-- 
2.39.5