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-rw-r--r--src/station_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 85e12fa25..1d4d2948f 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -1820,7 +1820,7 @@ CommandCost CmdBuildAirport(TileIndex tile, DoCommandFlag flags, uint32 p1, uint
if (distant_join && (!_settings_game.station.distant_join_stations || !IsValidStationID(station_to_join))) return CMD_ERROR;
/* Check if a valid, buildable airport was chosen for construction */
- if (p1 > lengthof(_airport_sections) || !HasBit(GetValidAirports(), p1)) return CMD_ERROR;
+ if (p1 >= lengthof(_airport_sections) || !HasBit(GetValidAirports(), p1)) return CMD_ERROR;
if (!CheckIfAuthorityAllowsNewStation(tile, flags)) {
return CMD_ERROR;