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This exception has no message.
java.util.ConcurrentModificationException: 	at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711)	at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:734)	at org.springframework.messaging.simp.broker.DefaultSubscriptionRegistry$DestinationCache.updateAfterRemovedSubscription(DefaultSubscriptionRegistry.java:191)	at org.springframework.messaging.simp.broker.DefaultSubscriptionRegistry.removeSubscriptionInternal(DefaultSubscriptionRegistry.java:100)	at org.springframework.messaging.simp.broker.AbstractSubscriptionRegistry.unregisterSubscription(AbstractSubscriptionRegistry.java:91)	at org.springframework.messaging.simp.broker.SimpleBrokerMessageHandler.handleMessageInternal(SimpleBrokerMessageHandler.java:129)	at org.springframework.messaging.simp.broker.AbstractBrokerMessageHandler.handleMessage(AbstractBrokerMessageHandler.java:171)	at org.springframework.messaging.support.ExecutorSubscribableChannel$1.run(ExecutorSubscribableChannel.java:70)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:744)