[2024-07-19 15:41:52:755] [SEVERE  ] [              in_5-muc ] StanzaProcessor.processPacket()  : null when processing from=s2s@ip-172-31-22-51.us-west-2.compute.internal, to=null, serverAuthorisedStanzaFrom=Optional.empty, DATA=<presence xmlns="jabber:client" type="unavailable" to="…@muc.jabber.today/b…o" from="…@n…a.im/gajim.…"><status>Disconnected: Received SIGTERM</status></presence>, SIZE=191, XMLNS=jabber:client, PRIORITY=PRESENCE, PERMISSION=REMOTE, TYPE=unavailable, STABLE_ID=null
java.util.ConcurrentModificationException
	at java.base/java.util.HashMap$HashIterator.nextNode(Unknown Source)
	at java.base/java.util.HashMap$KeyIterator.next(Unknown Source)
	at java.base/java.util.AbstractCollection.addAll(Unknown Source)
	at java.base/java.util.concurrent.ConcurrentSkipListSet.<init>(Unknown Source)
	at tigase.muc.Room.getLocalOccupantsJidsByNickname(Room.java:563)
	at tigase.muc.cluster.RoomClustered.getOccupantsJidsByNickname(SourceFile:137)
	at tigase.muc.modules.PresenceModuleImpl.doQuit(PresenceModuleImpl.java:183)
	at tigase.muc.modules.PresenceModuleImpl.processExit(PresenceModuleImpl.java:711)
	at tigase.muc.modules.PresenceModuleImpl.process(PresenceModuleImpl.java:336)
	at tigase.component.modules.StanzaProcessor.execute(StanzaProcessor.java:219)
	at tigase.component.modules.StanzaProcessor.process(StanzaProcessor.java:206)
	at tigase.component.modules.StanzaProcessor.processPacket(StanzaProcessor.java:103)
	at tigase.component.AbstractKernelBasedComponent.processPacket(AbstractKernelBasedComponent.java:81)
	at tigase.muc.MUCComponent.processPacket(MUCComponent.java:122)
	at tigase.muc.cluster.MUCComponentClustered.processPacket(SourceFile:87)
	at tigase.server.AbstractMessageReceiver$QueueListener.run(AbstractMessageReceiver.java:1398)