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-rw-r--r--src/disaster_cmd.cpp6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/disaster_cmd.cpp b/src/disaster_cmd.cpp
index 37a2a3bb0..ccdd230ca 100644
--- a/src/disaster_cmd.cpp
+++ b/src/disaster_cmd.cpp
@@ -983,11 +983,11 @@ static void Disaster_CoalMine_Init()
{
TileIndex tile = i->xy;
TileIndexDiff step = TileOffsByDiagDir((DiagDirection)GB(Random(), 0, 2));
- uint n;
- for (n = 0; n < 30; n++) {
+ for (uint n = 0; n < 30; n++) {
DisasterClearSquare(tile);
- tile = TILE_MASK(tile + step);
+ tile += step;
+ if (!IsValidTile(tile)) break;
}
}
return;