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java.lang.NullPointerException: 	at java.util.Objects.requireNonNull(Objects.java:203)	at org.graylog2.shared.system.activities.Activity.(Activity.java:34)	at org.graylog2.inputs.InputStateListener.inputStateChanged(InputStateListener.java:57)	at sun.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:95)	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:154)	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:80)	at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)	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:745)