NPE in LlapLoadGeneratorService During Tests

java.lang.NullPointerException: null
	at org.apache.hadoop.hive.llap.daemon.impl.LlapLoadGeneratorService.serviceStop(LlapLoadGeneratorService.java:103) ~[classes/:?]
	at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:220) ~[hadoop-common-3.1.0.jar:?]
	at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:54) ~[hadoop-common-3.1.0.jar:?]
	at org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:102) [hadoop-common-3.1.0.jar:?]
	at org.apache.hadoop.service.AbstractService.init(AbstractService.java:172) [hadoop-common-3.1.0.jar:?]
	at org.apache.hadoop.hive.llap.daemon.impl.TestLlapLoadGeneratorService.testLoadGeneratorFails(TestLlapLoadGeneratorService.java:70) [test-classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_102]