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java.lang.NullPointerException: 	at io.druid.query.aggregation.LongSumAggregator.combineValues(LongSumAggregator.java:39)	at io.druid.query.aggregation.LongSumAggregatorFactory.combine(LongSumAggregatorFactory.java:78)	at io.druid.segment.IndexMerger$RowboatMergeFunction.apply(IndexMerger.java:1242)	at io.druid.segment.IndexMerger$RowboatMergeFunction.apply(IndexMerger.java:1218)	at io.druid.collections.CombiningIterator.next(CombiningIterator.java:78)	at io.druid.segment.IndexMerger.makeIndexFiles(IndexMerger.java:730)	at io.druid.segment.IndexMerger.merge(IndexMerger.java:336)	at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:218)	at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:207)	at io.druid.segment.realtime.plumber.RealtimePlumber$4.doRun(RealtimePlumber.java:444)	at io.druid.common.guava.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:40)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)