--- a/src/simulator/simulator.cc	Mon Dec 11 19:36:48 2006 +0100
+++ b/src/simulator/simulator.cc	Mon Dec 11 19:37:53 2006 +0100
@@ -241,7 +241,6 @@
 void
 SimulatorPrivate::Cancel (EventId id)
 {
-  assert (m_events->IsValid (id));
   EventImpl *ev = id.GetEventImpl ();
   ev->Cancel ();
 }