Serial mysensors binding: NPE on MySensorsAbstractConnection.java:628 (MySensorsAbstractConnection$MySensorsWriter.access$3)

[gbrd]

When trying to send a message through a serial gateway I got :

19:37:12.527 [ERROR] [rnal.common.AbstractInvocationHandler] - An error occurred while calling method 'ThingHandler.handleCommand()' on 'org.openhab.binding.mysensors.handler.MySensorsThingHandler@4508f3bf': null
java.lang.NullPointerException: null
	at org.openhab.binding.mysensors.internal.protocol.MySensorsAbstractConnection$MySensorsWriter.access$3(MySensorsAbstractConnection.java:628) ~[?:?]
	at org.openhab.binding.mysensors.internal.protocol.MySensorsAbstractConnection.sendMessage(MySensorsAbstractConnection.java:248) ~[?:?]
	at org.openhab.binding.mysensors.internal.gateway.MySensorsGateway.sendMessage(MySensorsGateway.java:370) ~[?:?]
	at org.openhab.binding.mysensors.handler.MySensorsThingHandler.handleCommand(MySensorsThingHandler.java:197) ~[?:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
	at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
	at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:152) [bundleFile:?]
	at org.eclipse.smarthome.core.internal.common.InvocationHandlerSync.invoke(InvocationHandlerSync.java:59) [bundleFile:?]
	at com.sun.proxy.$Proxy170.handleCommand(Unknown Source) [?:?]
	at org.eclipse.smarthome.core.thing.internal.profiles.ProfileCallbackImpl.handleCommand(ProfileCallbackImpl.java:74) [bundleFile:?]
	at org.eclipse.smarthome.core.thing.internal.profiles.SystemDefaultProfile.onCommandFromItem(SystemDefaultProfile.java:48) [bundleFile:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
	at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
	at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:152) [bundleFile:?]
	at org.eclipse.smarthome.core.internal.common.Invocation.call(Invocation.java:52) [bundleFile:?]
	at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
	at java.lang.Thread.run(Thread.java:834) [?:?]

openhab 2.5.11-1 mysensors addon version ? downloaded here : http://www.oberfoell.com/openhab2/org.openhab.binding.mysensors-2.5.0-SNAPSHOT.jar today