diff -r 394a1b3d6f3e -r 0a1ce05c3d45 roadveh_cmd.c
--- a/roadveh_cmd.c	Sun Jan 30 19:51:39 2005 +0000
+++ b/roadveh_cmd.c	Sun Jan 30 20:50:06 2005 +0000
@@ -209,6 +209,8 @@
 {
 	Vehicle *v;
 
+	if (!IsVehicleIndex(p1)) return CMD_ERROR;
+
 	v = GetVehicle(p1);
 
 	if (v->type != VEH_Road || !CheckOwnership(v->owner))
@@ -229,13 +231,15 @@
 {
 	Vehicle *v;
 
-	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
+	if (!IsVehicleIndex(p1)) return CMD_ERROR;
 
 	v = GetVehicle(p1);
 
 	if (v->type != VEH_Road || !CheckOwnership(v->owner))
 		return CMD_ERROR;
 
+	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
+
 	if (!IsRoadDepotTile(v->tile) || v->u.road.state != 254 || !(v->vehstatus&VS_STOPPED))
 		return_cmd_error(STR_9013_MUST_BE_STOPPED_INSIDE);
 
@@ -307,9 +311,13 @@
 		 bit 2 = clear v->set_for_replacement */
 int32 CmdSendRoadVehToDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 {
-	Vehicle *v = GetVehicle(p1);
+	Vehicle *v;
 	int depot;
 
+	if (!IsVehicleIndex(p1)) return CMD_ERROR;
+
+	v = GetVehicle(p1);
+
 	if (v->type != VEH_Road || !CheckOwnership(v->owner))
 		return CMD_ERROR;
 
@@ -348,6 +356,8 @@
 {
 	Vehicle *v;
 
+	if (!IsVehicleIndex(p1)) return CMD_ERROR;
+
 	v = GetVehicle(p1);
 
 	if (v->type != VEH_Road || !CheckOwnership(v->owner))
@@ -373,6 +383,8 @@
 {
 	Vehicle *v;
 
+	if (!IsVehicleIndex(p1)) return CMD_ERROR;
+
 	v = GetVehicle(p1);
 
 	if (v->type != VEH_Road || !CheckOwnership(v->owner))