From dd9f1ce988e9d4c1185a7811ff491251e1d48af9 Mon Sep 17 00:00:00 2001
From: Gaspar Capello <gaspar@igara.com>
Date: Fri, 17 May 2024 16:06:13 -0300
Subject: [PATCH] Fix crash when previewing a sprite sheet export when
 selecting an empty layer group located at the bottom of the layer stack in
 the "Layers" combo box.

---
 src/doc/sprite.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/doc/sprite.cpp b/src/doc/sprite.cpp
index c9cfe2856..8b30f79f9 100644
--- a/src/doc/sprite.cpp
+++ b/src/doc/sprite.cpp
@@ -311,7 +311,7 @@ LayerImage* Sprite::backgroundLayer() const
 Layer* Sprite::firstLayer() const
 {
   Layer* layer = root()->firstLayer();
-  while (layer->isGroup())
+  while (layer && layer->isGroup())
     layer = static_cast<LayerGroup*>(layer)->firstLayer();
   return layer;
 }