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-rw-r--r--src/town_cmd.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index e87c4437f..1aadd5927 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -1256,6 +1256,7 @@ static bool GrowTownWithTunnel(const Town* t, const TileIndex tile, const DiagDi
/* Only tunnel under a mountain if the slope is continuous for at least 4 tiles. We want tunneling to be a last resort for large hills. */
TileIndex slope_tile = tile;
for (uint8 tiles = 0; tiles < 4; tiles++) {
+ if (!IsValidTile(slope_tile)) return false;
slope = GetTileSlope(slope_tile);
if (slope != InclinedSlope(tunnel_dir) && !IsSteepSlope(slope) && !IsSlopeWithOneCornerRaised(slope)) return false;
slope_tile += delta;