From f5561ac2123fcd76548bb1a407f01983ef82cc40 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)

(cherry picked from commit 7e70ead39629c557c4580d1d66be0cdcc37480ec)
---
 src/newgrf.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 5454819845..19a374002e 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -5378,6 +5378,11 @@ static void NewSpriteGroup(ByteReader *buf)
 						return;
 					}
 
+					if (num_loaded + num_loading == 0) {
+						grfmsg(1, "NewSpriteGroup: no result, skipping invalid RealSpriteGroup");
+						break;
+					}
+
 					assert(RealSpriteGroup::CanAllocateItem());
 					RealSpriteGroup *group = new RealSpriteGroup();
 					group->nfo_line = _cur.nfo_line;