--- a/telephonyserverplugins/common_tsy/commontsy/src/mmstorage/cmmonstoretsy.cpp	Wed Jul 21 17:41:03 2010 +0100
+++ b/telephonyserverplugins/common_tsy/commontsy/src/mmstorage/cmmonstoretsy.cpp	Thu Jul 29 12:12:57 2010 +0100
@@ -110,6 +110,7 @@
         {
         // deregister tsy object from message manager
         iMmPhone->MessageManager()->DeregisterTsyObject(this);
+		iMmPhone->SetONStoreTsy(NULL);
         }
 
     if ( NULL != iTsyReqHandleStore )