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java.lang.NullPointerException: null	at org.openhab.binding.omnilink.internal.ui.OmnilinkItemGenerator.generateSiteMap(OmnilinkItemGenerator.java:590)	at org.openhab.binding.omnilink.internal.ui.OmnilinkItemGenerator.generateItemsAndGroups(OmnilinkItemGenerator.java:173)	at org.openhab.binding.omnilink.internal.OmniLinkBinding$OmniConnectionThread.run(OmniLinkBinding.java:410)