In Fifo Scheduler, node heartbeat in between creating app and attempt causes NPE

19:11:13,441 FATAL ResourceManager:600 - Error in handling event type NODE_UPDATE to the scheduler
java.lang.NullPointerException
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler.assignContainers(FifoScheduler.java:462)
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler.nodeUpdate(FifoScheduler.java:714)
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler.handle(FifoScheduler.java:743)
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler.handle(FifoScheduler.java:104)
	at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:591)
	at java.lang.Thread.run(Thread.java:744)
19:11:13,443  INFO ResourceManager:604 - Exiting, bbye..