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

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java.lang.NullPointerException:
at net.sourceforge.eclipseccase.StateCacheFactory$2.compare(StateCacheFactory.java:488)
at java.util.Arrays.mergeSort(Arrays.java:1270)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.sort(Arrays.java:1210)
at net.sourceforge.eclipseccase.StateCacheFactory.writeStateCache(StateCacheFactory.java:484)
at net.sourceforge.eclipseccase.StateCacheFactory.saving(StateCacheFactory.java:425)
at org.eclipse.core.internal.resources.SaveManager.executeLifecycle(SaveManager.java:383)
at org.eclipse.core.internal.resources.SaveManager.broadcastLifecycle(SaveManager.java:195)
at org.eclipse.core.internal.resources.SaveManager.save(SaveManager.java:1130)

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