java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.eclipse.jgit.lib.ObjectIdOwnerMap.get(ObjectIdOwnerMap.java:131)
at org.eclipse.jgit.revwalk.RevWalk.parseAny(RevWalk.java:815)
at com.softwaremill.codebrag.repository.RepositoryDeltaLoader$class.setRangeStart(RepositoryDeltaLoader.scala:36)
at com.softwaremill.codebrag.repository.RepositoryDeltaLoader$class.com$softwaremill$codebrag$repository$RepositoryDeltaLoader$$getCommitsForBranch(RepositoryDeltaLoader.scala:18)
at com.softwaremill.codebrag.repository.RepositoryDeltaLoader$$anonfun$1.apply(RepositoryDeltaLoader.scala:28)
at com.softwaremill.codebrag.repository.RepositoryDeltaLoader$$anonfun$1.apply(RepositoryDeltaLoader.scala:27)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.immutable.Set$Set1.foreach(Set.scala:74)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractSet.scala$collection$SetLike$$super$map(Set.scala:47)
at scala.collection.SetLike$class.map(SetLike.scala:93)
at com.softwaremill.codebrag.repository.RepositoryDeltaLoader$class.loadCommitsSince(RepositoryDeltaLoader.scala:27)
at com.softwaremill.codebrag.repository.GitSvnRepository.loadCommitsSince(GitSvnRepository.scala:8)
at com.softwaremill.codebrag.service.commits.CommitImportService.importRepoCommits(CommitImportService.scala:21)
at com.softwaremill.codebrag.service.updater.RepoUpdateActor$$anonfun$receive$1.applyOrElse(RepoUpdateActor.scala:14)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:425)
at akka.actor.ActorCell.invoke(ActorCell.scala:386)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:230)
at akka.dispatch.Mailbox.run(Mailbox.scala:212)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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