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-rw-r--r--src/newgrf_engine.cpp2
-rw-r--r--src/vehicle.cpp1
2 files changed, 2 insertions, 1 deletions
diff --git a/src/newgrf_engine.cpp b/src/newgrf_engine.cpp
index d052d16bb..3bf9a93a4 100644
--- a/src/newgrf_engine.cpp
+++ b/src/newgrf_engine.cpp
@@ -1010,7 +1010,7 @@ static void DoTriggerVehicle(Vehicle *v, VehicleTrigger trigger, byte base_rando
* i.e.), so we give them all the NEW_CARGO triggered
* vehicle's portion of random bits. */
assert(first);
- DoTriggerVehicle(GetFirstVehicleInChain(v), VEHICLE_TRIGGER_ANY_NEW_CARGO, new_random_bits, false);
+ DoTriggerVehicle((v->type == VEH_Train) ? GetFirstVehicleInChain(v) : v, VEHICLE_TRIGGER_ANY_NEW_CARGO, new_random_bits, false);
break;
case VEHICLE_TRIGGER_DEPOT:
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 5197e6fc4..f76a49b96 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -515,6 +515,7 @@ Vehicle *GetFirstVehicleInChain(const Vehicle *v)
Vehicle* u;
assert(v != NULL);
+ assert(v->type == VEH_Train);
if (v->first != NULL) {
if (IsFrontEngine(v->first) || IsFreeWagon(v->first)) return v->first;