--- a/src/devices/wifi/mac-low.cc	Fri Jul 31 18:09:24 2009 +0400
+++ b/src/devices/wifi/mac-low.cc	Fri Jul 31 18:32:29 2009 +0400
@@ -271,7 +271,6 @@
 MacLow::DoDispose (void)
 {
   NS_LOG_FUNCTION (this);
-  m_listener = 0;
   CancelAllEvents ();
   m_phy = 0;
   m_stationManager = 0;