User join room problem

Openfire Openfire Dev
1

org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpl - 内部服务器错误

java.lang.NullPointerException

at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.sendInitialPresences(LocalMUCRoo m.java:724)

at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.joinRoom(LocalMUCRoom.java:639)

at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:485)

at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:197)

if (!canAnyoneDiscoverJID() && MUCRole.Role.moderator != joinRole.getRole()) {

occupantPresence = occupantPresence.createCopy();

Element frag = occupantPresence.getChildElement(“x”,

                    "[http://jabber.org/protocol/muc#user](http://jabber.org/protocol/muc#user)");

frag.element(“item”).addAttribute(“jid”, null); //this is 724 line

}