# HG changeset patch
# User rubidium <rubidium@openttd.org>
# Date 2009-12-16 00:06:51
# Node ID 4f31e407337a11fb4b8b30ca278b2ba5ffa5151f
# Parent  7022d2b81ca7bddf313d9947e22a710fdc9f05e7

(svn r18513) -Fix [FS#3379]: sometimes NewGRFs throw invalid data at OpenTTD and that triggered a check... that if a has to be between b and c (inclusive) then c must be bigger than or equal to b (and definitely not smaller)

diff --git a/src/newgrf_industrytiles.cpp b/src/newgrf_industrytiles.cpp
--- a/src/newgrf_industrytiles.cpp
+++ b/src/newgrf_industrytiles.cpp
@@ -253,10 +253,10 @@ bool DrawNewIndustryTile(TileInfo *ti, I
 	NewIndustryTileResolver(&object, gfx, ti->tile, i);
 
 	group = SpriteGroup::Resolve(inds->grf_prop.spritegroup, &object);
-	if (group == NULL || group->type != SGT_TILELAYOUT) {
+	const TileLayoutSpriteGroup *tlgroup = (const TileLayoutSpriteGroup *)group;
+	if (group == NULL || group->type != SGT_TILELAYOUT || tlgroup->num_sprites == 0) {
 		return false;
 	} else {
-		const TileLayoutSpriteGroup *tlgroup = (const TileLayoutSpriteGroup *)group;
 		/* Limit the building stage to the number of stages supplied. */
 		byte stage = GetIndustryConstructionStage(ti->tile);
 		stage = Clamp(stage - 4 + tlgroup->num_sprites, 0, tlgroup->num_sprites - 1);