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

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java.lang.NullPointerException:
at sun.plugin.cache.CacheFile.getFileType(Unknown Source)
at sun.plugin.cache.CacheFile.before(Unknown Source)
at sun.plugin.cache.CleanupThread$1.compare(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.sort(Unknown Source)
at sun.plugin.cache.CleanupThread.getFilesInCache(Unknown Source)
at sun.plugin.cache.CleanupThread.cleanCache(Unknown Source)

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