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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:332)	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:987)	at org.springframework.messaging.simp.broker.DefaultSubscriptionRegistry$SessionSubscriptionInfo.getSubscriptions(DefaultSubscriptionRegistry.java:315)	at org.springframework.messaging.simp.broker.DefaultSubscriptionRegistry.removeSubscriptionInternal(DefaultSubscriptionRegistry.java:98)	at org.springframework.messaging.simp.broker.AbstractSubscriptionRegistry.unregisterSubscription(AbstractSubscriptionRegistry.java:97)	at org.springframework.messaging.simp.broker.SimpleBrokerMessageHandler.handleMessageInternal(SimpleBrokerMessageHandler.java:154)	at org.springframework.messaging.simp.broker.AbstractBrokerMessageHandler.handleMessage(AbstractBrokerMessageHandler.java:171)	at org.springframework.messaging.support.ExecutorSubscribableChannel$1.run(ExecutorSubscribableChannel.java:70)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)