I see this errors in the startup procedure
2017-12-26 21:19:11.769 [ERROR] [.zway.handler.ZWayZWaveDeviceHandler] - Error occurred when performing polling:null
2017-12-26 21:20:11.982 [ERROR] [ome.core.thing.link.ThingLinkManager] - Exception occurred while informing handler: null
java.lang.NumberFormatException: null
at java.math.BigDecimal.(BigDecimal.java:596) ~[?:?]
at java.math.BigDecimal.(BigDecimal.java:383) ~[?:?]
at java.math.BigDecimal.(BigDecimal.java:806) ~[?:?]
at org.eclipse.smarthome.core.library.types.DecimalType.(DecimalType.java:55) ~[?:?]
at org.openhab.binding.zway.handler.ZWayDeviceHandler.refreshChannel(ZWayDeviceHandler.java:360) ~[?:?]
at org.openhab.binding.zway.handler.ZWayDeviceHandler.handleCommand(ZWayDeviceHandler.java:634) ~[?:?]
at org.eclipse.smarthome.core.thing.binding.BaseThingHandler.channelLinked(BaseThingHandler.java:243) ~[?:?]
at org.openhab.binding.zway.handler.ZWayDeviceHandler.channelLinked(ZWayDeviceHandler.java:392) ~[?:?]
at org.eclipse.smarthome.core.thing.link.ThingLinkManager.lambda$0(ThingLinkManager.java:290) ~[?:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
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