java.lang.NullPointerException
   at org.eclipse.jgit.dircache.DirCacheCheckout.processEntry(DirCacheCheckout.java:682)
   at org.eclipse.jgit.dircache.DirCacheCheckout.preScanTwoTrees(DirCacheCheckout.java:246)
   at org.eclipse.jgit.dircache.DirCacheCheckout.doCheckout(DirCacheCheckout.java:395)
   at org.eclipse.jgit.dircache.DirCacheCheckout.checkout(DirCacheCheckout.java:381)
   at org.netbeans.libs.git.jgit.commands.CheckoutRevisionCommand.run(CheckoutRevisionCommand.java:111)
   at org.netbeans.libs.git.jgit.commands.GitCommand.execute(GitCommand.java:73)
   at org.netbeans.libs.git.GitClient.checkoutRevision(GitClient.java:319)
   at org.netbeans.modules.git.client.GitClient$6.call(GitClient.java:275)
   at org.netbeans.modules.git.client.GitClient$6.call(GitClient.java:271)
   at org.netbeans.modules.git.client.GitClient$CommandInvoker$1$1.call(GitClient.java:792)
   at org.netbeans.modules.versioning.indexingbridge.Bridge$1.call(Bridge.java:64)
   at org.netbeans.modules.parsing.api.indexing.IndexingManager.runProtected(IndexingManager.java:395)
   at org.netbeans.modules.versioning.indexingbridge.Bridge.runWithoutIndexing(Bridge.java:59)
   at org.netbeans.modules.versioning.util.IndexingBridge.runWithoutIndexing(IndexingBridge.java:139)
   at org.netbeans.modules.versioning.util.IndexingBridge.runWithoutIndexing(IndexingBridge.java:102)
   at org.netbeans.modules.git.client.GitClient$CommandInvoker$1.call(GitClient.java:813)
   at org.netbeans.modules.git.FilesystemInterceptor.runWithoutExternalEvents(FilesystemInterceptor.java:429)
   at org.netbeans.modules.git.Git.runWithoutExternalEvents(Git.java:275)
   at org.netbeans.modules.git.client.GitClient$CommandInvoker.runMethodIntern(GitClient.java:821)
   at org.netbeans.modules.git.client.GitClient$CommandInvoker.runMethod(GitClient.java:752)
   at org.netbeans.modules.git.client.GitClient$CommandInvoker.access$300(GitClient.java:728)
   at org.netbeans.modules.git.client.GitClient.checkoutRevision(GitClient.java:271)
   at org.netbeans.modules.git.ui.checkout.AbstractCheckoutAction$1.perform(AbstractCheckoutAction.java:126)
   at org.netbeans.modules.git.client.GitProgressSupport.performIntern(GitProgressSupport.java:102)
   at org.netbeans.modules.git.client.GitProgressSupport.run(GitProgressSupport.java:95)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2048)