NPE under specific conditions

A customer got the following stacktrace:
Error occurred while running Task 'Get QC BizTalk(13)' of type com.atlassian.bamboo.plugins.vcs:task.vcs.checkout.
java.lang.RuntimeException: com.atlassian.bamboo.repository.RepositoryException: java.lang.NullPointerException
 at com.atlassian.bamboo.executor.RetryingTaskExecutor.rerun(RetryingTaskExecutor.java:132)
 at com.atlassian.bamboo.executor.RetryingTaskExecutor.runTask(RetryingTaskExecutor.java:88)
 at com.atlassian.bamboo.executor.RetryingTaskExecutor.retry(RetryingTaskExecutor.java:191)
 at com.atlassian.bamboo.executor.RetryingTaskExecutor.retry(RetryingTaskExecutor.java:176)
 at com.atlassian.bamboo.plugins.vcs.task.VcsCheckoutTask.execute(VcsCheckoutTask.java:172)
 at com.atlassian.bamboo.task.TaskExecutorImpl.executeTasks(TaskExecutorImpl.java:220)
 at com.atlassian.bamboo.task.TaskExecutorImpl.executePreparationTasks(TaskExecutorImpl.java:73)
 at com.atlassian.bamboo.build.pipeline.tasks.PrepareBuildTask.call(PrepareBuildTask.java:74)
 at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent.build(DefaultBuildAgent.java:188)
 at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:112)
 at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent$1.run(DefaultBuildAgent.java:110)
 at com.atlassian.bamboo.utils.BambooRunnables$1.run(BambooRunnables.java:49)
 at com.atlassian.bamboo.security.ImpersonationHelper.runWith(ImpersonationHelper.java:31)
 at com.atlassian.bamboo.security.ImpersonationHelper.runWithSystemAuthority(ImpersonationHelper.java:20)
 at com.atlassian.bamboo.security.ImpersonationHelper$1.run(ImpersonationHelper.java:52)
 at java.lang.Thread.run(Unknown Source)
Caused by: com.atlassian.bamboo.repository.RepositoryException: java.lang.NullPointerException
 at com.stellarity.bamboo.repository.TfsRepository.retrieveSourceCode(TfsRepository.java:358)
 at com.atlassian.bamboo.plugins.vcs.task.VcsCheckoutTask.fillWorkingDirFromVcs(VcsCheckoutTask.java:259)
 at com.atlassian.bamboo.plugins.vcs.task.VcsCheckoutTask.access$100(VcsCheckoutTask.java:56)
 at com.atlassian.bamboo.plugins.vcs.task.VcsCheckoutTask$2.call(VcsCheckoutTask.java:177)
 at com.atlassian.bamboo.plugins.vcs.task.VcsCheckoutTask$2.call(VcsCheckoutTask.java:173)
 at com.atlassian.bamboo.executor.RetryingTaskExecutor.rerun(RetryingTaskExecutor.java:108)
 ... 15 more
Caused by: java.lang.NullPointerException
 at com.stellarity.bamboo.repository.TfsRepository.isOverlappedPath(TfsRepository.java:885)
 at com.stellarity.bamboo.repository.TfsRepository.findClosestWorkspaceByPath(TfsRepository.java:657)
 at com.stellarity.bamboo.repository.TfsRepository.getWorkspace(TfsRepository.java:549)
 at com.stellarity.bamboo.repository.TfsRepository.tryToRetrieveSourceCode(TfsRepository.java:722)
 at com.stellarity.bamboo.repository.TfsRepository.retrieveSourceCode(TfsRepository.java:336)
 ... 20 more
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