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

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java.lang.NullPointerException:
at java.util.Collections$ReverseComparator.compare(Unknown Source)
at java.util.Collections$ReverseComparator.compare(Unknown Source)
at java.util.TimSort.countRunAndMakeAscending(Unknown Source)
at java.util.TimSort.sort(Unknown Source)
at java.util.TimSort.sort(Unknown Source)
at java.util.Arrays.sort(Unknown Source)
at java.util.Collections.sort(Unknown Source)
at com.atom217.thread.QueryTask.run(QueryTask.java:60)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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