NPE encountered while checking if project is in build queue using distributed build

org.apache.continuum.distributed.transport.master.MasterBuildAgentTransportClient

• Prepare build finished.
  [pool-2-thread-1] INFO
  org.apache.continuum.buildagent.taskqueue.execution.PrepareBuildProjectsTaskExecutor
• Performing action create-agent-build-project-task
  [pool-1-thread-1] INFO
  org.apache.continuum.buildagent.taskqueue.execution.BuildProjectTaskExecutor
• Initializing build
  [pool-2-thread-1] ERROR taskQueueExecutor#prepare-build-agent - Error
  executing task
  org.codehaus.plexus.taskqueue.execution.TaskExecutionException: Error
  executing action 'create-agent-build-project-task'
  at
  org.apache.continuum.buildagent.taskqueue.execution.PrepareBuildProjectsTaskExecutor.performAction(PrepareBuildProjectsTaskExecutor.java:387)
  at
  org.apache.continuum.buildagent.taskqueue.execution.PrepareBuildProjectsTaskExecutor.buildProjects(PrepareBuildProjectsTaskExecutor.java:442)
  at
  org.apache.continuum.buildagent.taskqueue.execution.PrepareBuildProjectsTaskExecutor.executeTask(PrepareBuildProjectsTaskExecutor.java:149)
  at
  org.codehaus.plexus.taskqueue.execution.ThreadedTaskQueueExecutor$ExecutorRunnable$1.run(ThreadedTaskQueueExecutor.java:116)
  at
  edu.emory.mathcs.backport.java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
  at
  edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:176)
  at
  edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:987)
  at
  edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:528)
  at java.lang.Thread.run(Thread.java:595)
  Caused by: java.lang.NullPointerException
  at
  org.apache.continuum.buildagent.taskqueue.manager.DefaultBuildAgentTaskQueueManager.isProjectInBuildQueue(DefaultBuildAgentTaskQueueManager.java:205)
  at
  org.apache.continuum.buildagent.action.CreateBuildProjectTaskAction.execute(CreateBuildProjectTaskAction.java:83)
  at
  org.apache.continuum.buildagent.taskqueue.execution.PrepareBuildProjectsTaskExecutor.performAction(PrepareBuildProjectsTaskExecutor.java:378)
  ... 8 more