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Another NullPointerException
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Asking for COV Subscriptions ended in NPE:
[BACnet4J transport] ERROR com.serotonin.bacnet4j.transport.DefaultTransport - Error during receive: NPDU [from=Address [networkNumber=0, macAddress=[c0,a8,0,83,ba,c0]], linkService=null, queue=[]] java.lang.NullPointerException at com.serotonin.bacnet4j.type.Encodable.write(Encodable.java:234) at com.serotonin.bacnet4j.type.constructed.ObjectPropertyReference.write(ObjectPropertyReference.java:58) at com.serotonin.bacnet4j.type.constructed.BaseType.write(BaseType.java:41) at com.serotonin.bacnet4j.type.Encodable.write(Encodable.java:234) at com.serotonin.bacnet4j.type.constructed.CovSubscription.write(CovSubscription.java:57) at com.serotonin.bacnet4j.type.constructed.SequenceOf.write(SequenceOf.java:62) at com.serotonin.bacnet4j.type.constructed.BaseType.write(BaseType.java:41) at com.serotonin.bacnet4j.type.Encodable.writeEncodable(Encodable.java:323) at com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyAck.write(ReadPropertyAck.java:88) at com.serotonin.bacnet4j.transport.DefaultTransport.sendConfirmedResponse(DefaultTransport.java:752) at com.serotonin.bacnet4j.transport.DefaultTransport.incomingConfirmedRequest(DefaultTransport.java:704) at com.serotonin.bacnet4j.transport.DefaultTransport.receiveAPDU(DefaultTransport.java:531) at com.serotonin.bacnet4j.transport.DefaultTransport.receiveImpl(DefaultTransport.java:463) at com.serotonin.bacnet4j.transport.DefaultTransport.run(DefaultTransport.java:404) at java.lang.Thread.run(Thread.java:745) ```
