java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.eclipse.jgit.internal.storage.file.UnpackedObjectCache$Table.index(UnpackedObjectCache.java:146)
at org.eclipse.jgit.internal.storage.file.UnpackedObjectCache$Table.contains(UnpackedObjectCache.java:109)
at org.eclipse.jgit.internal.storage.file.UnpackedObjectCache.isUnpacked(UnpackedObjectCache.java:64)
at org.eclipse.jgit.internal.storage.file.ObjectDirectory.openObject(ObjectDirectory.java:367)
at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:145)
at org.eclipse.jgit.treewalk.CanonicalTreeParser.reset(CanonicalTreeParser.java:202)
at javadiff.RepoDiff.compare(RepoDiff.java:40)
at javadiff.GitDiff.main(GitDiff.java:30)

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