Session sendToTarget(Message message, SessionID sessionID) throws NullPointerException

Here is the excerpt from our application:

try {
...
Session.sendToTarget(message, sessionID);
...
}
catch (SessionNotFound e) {
...
}
catch (XXXException e) {
...
}

the sessionID was set to null due to some reason and we got a NullPointerException

java.lang.NullPointerException
at quickfix.Message.setSessionID(Message.java:423)
at quickfix.Session.sendToTarget(Session.java:454)

But in the sendToTaget method:

public static boolean sendToTarget(Message message, SessionID sessionID)
throws SessionNotFound

{ message.setSessionID(sessionID); Session session = lookupSession(sessionID); if(session == null) throw new SessionNotFound(); else return session.send(message); }

should the message.setSessionID(sessionID) line be put into the else block?