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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.hash(	at java.util.concurrent.ConcurrentHashMap.get(	at org.jitsi.jicofo.auth.AbstractAuthAuthority.getSession(	at org.jitsi.jicofo.auth.XMPPDomainAuthAuthority.processAuthLocked(	at org.jitsi.jicofo.auth.AbstractAuthAuthority.processAuthentication(	at org.jitsi.jicofo.xmpp.FocusComponent.processExtensions(	at org.jitsi.jicofo.xmpp.FocusComponent.handleConferenceIq(	at org.jitsi.jicofo.xmpp.FocusComponent.handleIQSet(	at org.xmpp.component.AbstractComponent.processIQRequest(	at org.xmpp.component.AbstractComponent.processIQ(	at org.xmpp.component.AbstractComponent.processQueuedPacket(	at org.xmpp.component.AbstractComponent.access$100(	at org.xmpp.component.AbstractComponent$	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at