potential fix for MODLANG-54

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7995 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_cpp.cpp

@@ -85,10 +85,12 @@ CoreSession::CoreSession(switch_core_session_t *new_session)
 {
 	memset(&caller_profile, 0, sizeof(caller_profile)); 
 	init_vars();
-	session = new_session;
-	channel = switch_core_session_get_channel(session);
-	allocated = 1;
-	switch_core_session_read_lock(session);
+	if (new_session) {
+		session = new_session;
+		channel = switch_core_session_get_channel(session);
+		allocated = 1;
+		switch_core_session_read_lock(session);
+	}
 }
 
 CoreSession::~CoreSession()