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java.lang.UnsupportedOperationException: null	at java.util.AbstractCollection.add(AbstractCollection.java:221)	at java.util.AbstractCollection.addAll(AbstractCollection.java:305)	at org.apache.syncope.core.sync.impl.SyncopeSyncResultHandler.updateUser(SyncopeSyncResultHandler.java:678)	at org.apache.syncope.core.sync.impl.SyncopeSyncResultHandler.update(SyncopeSyncResultHandler.java:769)	at org.apache.syncope.core.sync.impl.SyncopeSyncResultHandler.doHandle(SyncopeSyncResultHandler.java:954)	at org.apache.syncope.core.sync.impl.SyncopeSyncResultHandler.handle(SyncopeSyncResultHandler.java:275)	at org.identityconnectors.framework.impl.api.StreamHandlerUtil$ObjectStreamHandlerAdapter.handle(StreamHandlerUtil.java:82)	at org.identityconnectors.framework.impl.api.BufferedResultsProxy.invoke(BufferedResultsProxy.java:268)	at org.identityconnectors.framework.impl.api.DelegatingTimeoutProxy.invoke(DelegatingTimeoutProxy.java:102)	at com.sun.proxy.$Proxy1729.sync(Unknown Source)	at sun.reflect.GeneratedMethodAccessor919.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.identityconnectors.framework.impl.api.LoggingProxy.invoke(LoggingProxy.java:76)	at com.sun.proxy.$Proxy1729.sync(Unknown Source)	at org.identityconnectors.framework.impl.api.AbstractConnectorFacade.sync(AbstractConnectorFacade.java:251)	at org.apache.syncope.core.propagation.impl.ConnectorFacadeProxy.sync(ConnectorFacadeProxy.java:241)	at org.apache.syncope.core.sync.impl.SyncJob.executeWithSecurityContext(SyncJob.java:420)	at org.apache.syncope.core.sync.impl.SyncJob.doExecute(SyncJob.java:342)	at org.apache.syncope.core.quartz.AbstractTaskJob.execute(AbstractTaskJob.java:126)	at org.quartz.core.JobRunShell.run(JobRunShell.java:213)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557)