--- a/realtimenetprots/sipfw/SIP/Server/src/CSipCSSession.cpp	Wed Jun 09 10:04:26 2010 +0300
+++ b/realtimenetprots/sipfw/SIP/Server/src/CSipCSSession.cpp	Mon Jun 21 16:03:44 2010 +0300
@@ -252,7 +252,10 @@
             {
             TInt handle = 0;
             ITC().ReadL(aMessage,handle,ESipItcArgSubSessionHandle);
-            CloseSubSession (handle);
+			if(iSubSessionIndex->AtL(handle))
+	            CloseSubSession (handle);
+			else
+				{}
             } 
             break;