java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:988)
at org.jitsi.jicofo.auth.AbstractAuthAuthority.getSession(AbstractAuthAuthority.java:290)
at org.jitsi.jicofo.auth.XMPPDomainAuthAuthority.processAuthLocked(XMPPDomainAuthAuthority.java:86)
at org.jitsi.jicofo.auth.AbstractAuthAuthority.processAuthentication(AbstractAuthAuthority.java:415)
at org.jitsi.jicofo.xmpp.FocusComponent.processExtensions(FocusComponent.java:368)
at org.jitsi.jicofo.xmpp.FocusComponent.handleConferenceIq(FocusComponent.java:429)
at org.jitsi.jicofo.xmpp.FocusComponent.handleIQSet(FocusComponent.java:274)
at org.xmpp.component.AbstractComponent.processIQRequest(AbstractComponent.java:515)
at org.xmpp.component.AbstractComponent.processIQ(AbstractComponent.java:289)
at org.xmpp.component.AbstractComponent.processQueuedPacket(AbstractComponent.java:239)
at org.xmpp.component.AbstractComponent.access$100(AbstractComponent.java:81)
at org.xmpp.component.AbstractComponent$PacketProcessor.run(AbstractComponent.java:1051)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

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