java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.eclipse.paho.client.mqttv3.MqttTopic.validate(MqttTopic.java:147)
at org.eclipse.paho.client.mqttv3.MqttAsyncClient.unsubscribe(MqttAsyncClient.java:917)
at org.eclipse.paho.client.mqttv3.MqttAsyncClient.unsubscribe(MqttAsyncClient.java:898)
at com.ibm.iotf.devicemgmt.device.ManagedDevice.unsubscribe(ManagedDevice.java:636)
at com.ibm.iotf.devicemgmt.device.ManagedDevice$ManagedDeviceClient.unsubscribe(ManagedDevice.java:977)
at com.ibm.internal.iotf.devicemgmt.handler.DMRequestHandler.clearRequestHandlers(DMRequestHandler.java:239)
at com.ibm.iotf.devicemgmt.device.ManagedDevice.sendUnmanageRequest(ManagedDevice.java:530)
at com.ibm.iotcloud.test.jmeter.sampler.dm.FirmwareActions.deleteDevice(FirmwareActions.java:193)
at com.ibm.iotcloud.test.jmeter.sampler.dm.FirmwareActions.teardownTest(FirmwareActions.java:256)
at org.apache.jmeter.engine.StandardJMeterEngine.notifyTestListenersOfEnd(StandardJMeterEngine.java:215)
at org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:436)
at java.lang.Thread.run(Unknown Source)

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