Unable to build multiple independent projects in the same project group when distributed build is enabled

Building multiple independent projects in the same project group result to a build error.

java.lang.NullPointerException
at org.apache.continuum.builder.distributed.executor.DistributedBuildProjectTaskExecutor.initializeBuildContext(DistributedBuildProjectTaskExecutor.java:144)
at org.apache.continuum.builder.distributed.executor.DistributedBuildProjectTaskExecutor.executeTask(DistributedBuildProjectTaskExecutor.java:107)
at org.apache.continuum.builder.distributed.executor.ThreadedDistributedBuildTaskQueueExecutor$ExecutorRunnable$1.run(ThreadedDistributedBuildTaskQueueExecutor.java:118)
at edu.emory.mathcs.backport.java.util.concurrent.Executors$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)