diff -r 980b3d0c4069 -r ac20d6a0a19d telephonyserverplugins/common_tsy/commontsy/src/mmstorage/cmmonstoretsy.cpp
--- a/telephonyserverplugins/common_tsy/commontsy/src/mmstorage/cmmonstoretsy.cpp	Mon Aug 09 17:35:42 2010 +0100
+++ b/telephonyserverplugins/common_tsy/commontsy/src/mmstorage/cmmonstoretsy.cpp	Mon Aug 09 17:43:08 2010 +0100
@@ -110,6 +110,7 @@
         {
         // deregister tsy object from message manager
         iMmPhone->MessageManager()->DeregisterTsyObject(this);
+		iMmPhone->SetONStoreTsy(NULL);
         }
 
     if ( NULL != iTsyReqHandleStore )