From 7e70ead39629c557c4580d1d66be0cdcc37480ec Mon Sep 17 00:00:00 2001
From: PeterN <peter1138@openttd.org>
Date: Sun, 19 Sep 2021 21:52:08 +0100
Subject: [PATCH] Fix #9562: Handle case of invalid action2 with zero results.
 (#9564)

---
 src/newgrf.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 5ceadfd961..8a88e52032 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -5168,6 +5168,11 @@ static void NewSpriteGroup(ByteReader *buf)
 					grfmsg(6, "NewSpriteGroup: New SpriteGroup 0x%02X, %u loaded, %u loading",
 							setid, num_loaded, num_loading);
 
+					if (num_loaded + num_loading == 0) {
+						grfmsg(1, "NewSpriteGroup: no result, skipping invalid RealSpriteGroup");
+						break;
+					}
+
 					if (num_loaded + num_loading == 1) {
 						/* Avoid creating 'Real' sprite group if only one option. */
 						uint16 spriteid = buf->ReadWord();