==> /var/log/openhab2/openhab.log <==
2019-07-18 17:07:22.839 [ERROR] [nal.common.AbstractInvocationHandler] - An error occurred while calling method 'ThingHandler.handleCommand()' on 'org.eclipse.smarthome.binding.mqtt.generic.internal.handler.GenericThingHandler@18d624a': null
java.lang.NumberFormatException: null
at java.math.BigDecimal.<init>(BigDecimal.java:497) ~[?:?]
at java.math.BigDecimal.<init>(BigDecimal.java:383) ~[?:?]
at java.math.BigDecimal.<init>(BigDecimal.java:809) ~[?:?]
at org.eclipse.smarthome.core.library.types.DecimalType.<init>(DecimalType.java:57) ~[102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.core.library.types.PercentType.<init>(PercentType.java:47) ~[102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.core.library.types.PercentType.valueOf(PercentType.java:63) ~[102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.binding.mqtt.generic.internal.values.PercentageValue.update(PercentageValue.java:87) ~[?:?]
at org.eclipse.smarthome.binding.mqtt.generic.internal.generic.ChannelState.publishValue(ChannelState.java:302) ~[?:?]
at org.eclipse.smarthome.binding.mqtt.generic.internal.handler.AbstractMQTTThingHandler.handleCommand(AbstractMQTTThingHandler.java:119) ~[?:?]
at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:153) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.core.internal.common.InvocationHandlerSync.invoke(InvocationHandlerSync.java:59) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at com.sun.proxy.$Proxy153.handleCommand(Unknown Source) [235:org.eclipse.smarthome.binding.mqtt.generic:0.10.0.oh240]
at org.eclipse.smarthome.core.thing.internal.profiles.ProfileCallbackImpl.handleCommand(ProfileCallbackImpl.java:75) [109:org.eclipse.smarthome.core.thing:0.10.0.oh240]
at org.eclipse.smarthome.core.thing.internal.profiles.SystemDefaultProfile.onCommandFromItem(SystemDefaultProfile.java:49) [109:org.eclipse.smarthome.core.thing:0.10.0.oh240]
at sun.reflect.GeneratedMethodAccessor208.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:153) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.core.internal.common.Invocation.call(Invocation.java:53) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
Das passiert wenn ich das von dir oben geschriebene umsetze
