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java.lang.NullPointerException: 	at org.eclipse.smarthome.binding.sonos.handler.ZonePlayerHandler.handleCommand(ZonePlayerHandler.java:292)	at org.eclipse.smarthome.core.thing.internal.ThingManager$2.call(ThingManager.java:371)	at org.eclipse.smarthome.core.thing.internal.ThingManager$2.call(ThingManager.java:1)	at org.eclipse.smarthome.core.common.SafeMethodCaller$CallableWrapper.call(SafeMethodCaller.java:170)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	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)