Error starting ec2 instances

java.lang.NullPointerException
	at java.util.TreeMap.getEntry(TreeMap.java:324)
	at java.util.TreeMap.get(TreeMap.java:255)
	at com.atlassian.aws.ec2.SpotPriceMatrix.getPrice(SpotPriceMatrix.java:110)
	at com.atlassian.bamboo.agent.elastic.server.SpotInstanceConfig.getBid(SpotInstanceConfig.java:59)
	at com.atlassian.bamboo.agent.elastic.server.RemoteElasticInstanceImpl$Starter.run(RemoteElasticInstanceImpl.java:225)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)