--- a/src/vehicle.cpp	Fri Aug 31 12:45:21 2007 +0000
+++ b/src/vehicle.cpp	Fri Aug 31 12:57:52 2007 +0000
@@ -547,6 +547,7 @@
 
 	if (CleaningPool()) return;
 
+	this->SetNext(NULL);
 	UpdateVehiclePosHash(this, INVALID_COORD, 0);
 	this->next_hash = NULL;
 	this->next_new_hash = NULL;