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-rw-r--r--src/roadveh_cmd.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
index 74e1e9c14..e6198bbc0 100644
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -165,6 +165,7 @@ static uint GetRoadVehLength(const RoadVehicle *v)
uint16 veh_len = GetVehicleCallback(CBID_VEHICLE_LENGTH, 0, 0, v->engine_type, v);
if (veh_len != CALLBACK_FAILED) {
+ if (veh_len >= VEHICLE_LENGTH) ErrorUnknownCallbackResult(v->GetGRFID(), CBID_VEHICLE_LENGTH, veh_len);
length -= Clamp(veh_len, 0, VEHICLE_LENGTH - 1);
}