From 76b83437775ccae7e722fc41d7e4564b64188776 Mon Sep 17 00:00:00 2001
From: SamuXarick <43006711+SamuXarick@users.noreply.github.com>
Date: Wed, 11 Aug 2021 18:21:34 +0100
Subject: Fix #9392: Return a valid value with GetBuildWithRefitCapacity when
 AIs are maxed out in vehicles (#9393)

---
 src/vehicle_cmd.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vehicle_cmd.cpp b/src/vehicle_cmd.cpp
index 499b3b3eb..f3e0a99b8 100644
--- a/src/vehicle_cmd.cpp
+++ b/src/vehicle_cmd.cpp
@@ -124,7 +124,7 @@ CommandCost CmdBuildVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1, uint
 	/* Check whether we can allocate a unit number. Autoreplace does not allocate
 	 * an unit number as it will (always) reuse the one of the replaced vehicle
 	 * and (train) wagons don't have an unit number in any scenario. */
-	UnitID unit_num = (flags & DC_AUTOREPLACE || (type == VEH_TRAIN && e->u.rail.railveh_type == RAILVEH_WAGON)) ? 0 : GetFreeUnitNumber(type);
+	UnitID unit_num = (flags & DC_QUERY_COST || flags & DC_AUTOREPLACE || (type == VEH_TRAIN && e->u.rail.railveh_type == RAILVEH_WAGON)) ? 0 : GetFreeUnitNumber(type);
 	if (unit_num == UINT16_MAX) return_cmd_error(STR_ERROR_TOO_MANY_VEHICLES_IN_GAME);
 
 	/* If we are refitting we need to temporarily purchase the vehicle to be able to
-- 
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