[2022-04-30 14:21:26:183] [SEVERE  ] [           in_2-pubsub ] StanzaProcessor.processPacket()  : java.lang.NullPointerException when processing from=s2s@ip-172-31-0-99.us-west-2.compute.internal, to=pubsub@ip-172-31-0-99.us-west-2.compute.internal, serverAuthorisedStanzaFrom=Optional.empty, DATA=<iq id="B2DDDB2C-…-41EF5CCB1C9C" type="set" xmlns="jabber:client" from="…@xmpp.is/Monal-…" to="…@tigase.im"><pubsub xmlns="http://jabber.org/protocol/pubsub"><unsubscribe node="eu.siacs.conversations.axolotl.devicelist" jid="…@xmpp.is"/></pubsub></iq>, SIZE=294, XMLNS=jabber:client, PRIORITY=NORMAL, PERMISSION=NONE, TYPE=set, STABLE_ID=null
java.lang.RuntimeException: java.lang.NullPointerException
	at tigase.pubsub.modules.UnsubscribeNodeModule.process(UnsubscribeNodeModule.java:96)
	at tigase.component.modules.StanzaProcessor.execute(StanzaProcessor.java:214)
	at tigase.component.modules.StanzaProcessor.process(StanzaProcessor.java:201)
	at tigase.component.modules.StanzaProcessor.processPacket(StanzaProcessor.java:103)
	at tigase.component.AbstractKernelBasedComponent.processPacket(AbstractKernelBasedComponent.java:81)
	at tigase.pubsub.PubSubComponent.processPacket(PubSubComponent.java:191)
	at tigase.pubsub.cluster.PubSubComponentClustered.processPacket(SourceFile:183)
	at tigase.server.AbstractMessageReceiver$QueueListener.run(AbstractMessageReceiver.java:1398)
Caused by: java.lang.NullPointerException
	at tigase.pubsub.modules.UnsubscribeNodeModule.process(UnsubscribeNodeModule.java:83)
	... 7 more