# HG changeset patch
# User smatz <smatz@openttd.org>
# Date 1203443130 0
# Node ID 9713029d68ba2e80b0f0ab9d0d414c14a7020aad
# Parent  850d589306620b85188cf4be8b6c57f1d042e41b
(svn r12186) -Fix [FS#1784](r12169): assert when trying to play tile sound at NW border of map (placing buyos, leveling land)

diff --git a/src/sound.cpp b/src/sound.cpp
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -241,7 +241,8 @@
 	/* emits sound from center of the tile */
 	int x = TileX(tile) * TILE_SIZE + TILE_SIZE / 2;
 	int y = TileY(tile) * TILE_SIZE - TILE_SIZE / 2;
-	Point pt = RemapCoords(x, y, GetSlopeZ(x, y));
+	uint z = (y < 0 ? 0 : GetSlopeZ(x, y));
+	Point pt = RemapCoords(x, y, z);
 	y += 2 * TILE_SIZE;
 	Point pt2 = RemapCoords(x, y, GetSlopeZ(x, y));
 	SndPlayScreenCoordFx(sound, pt.x, pt2.x, pt.y, pt2.y);