diff -r 740ceea8e153 -r 3c8db403127f realtimenetprots/sipfw/SIP/Server/src/CSipCSSession.cpp
--- a/realtimenetprots/sipfw/SIP/Server/src/CSipCSSession.cpp	Fri Jun 11 14:01:23 2010 +0300
+++ b/realtimenetprots/sipfw/SIP/Server/src/CSipCSSession.cpp	Wed Jun 23 18:36:31 2010 +0300
@@ -252,7 +252,10 @@
             {
             TInt handle = 0;
             ITC().ReadL(aMessage,handle,ESipItcArgSubSessionHandle);
-            CloseSubSession (handle);
+			if(iSubSessionIndex->AtL(handle))
+	            CloseSubSession (handle);
+			else
+				{}
             } 
             break;