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java.lang.AssertionError: null	at org.apache.cassandra.db.rows.BufferCell.(BufferCell.java:49)	at org.apache.cassandra.db.rows.BufferCell.tombstone(BufferCell.java:88)	at org.apache.cassandra.db.rows.BufferCell.tombstone(BufferCell.java:83)	at org.apache.cassandra.db.rows.BufferCell.purge(BufferCell.java:175)	at org.apache.cassandra.db.rows.ComplexColumnData.lambda$purge$107(ComplexColumnData.java:165)	at org.apache.cassandra.utils.btree.BTree$FiltrationTracker.apply(BTree.java:650)	at org.apache.cassandra.utils.btree.BTree.transformAndFilter(BTree.java:693)	at org.apache.cassandra.utils.btree.BTree.transformAndFilter(BTree.java:668)	at org.apache.cassandra.db.rows.ComplexColumnData.transformAndFilter(ComplexColumnData.java:170)	at org.apache.cassandra.db.rows.ComplexColumnData.purge(ComplexColumnData.java:165)	at org.apache.cassandra.db.rows.ComplexColumnData.purge(ComplexColumnData.java:43)	at org.apache.cassandra.db.rows.BTreeRow.lambda$purge$102(BTreeRow.java:333)	at org.apache.cassandra.utils.btree.BTree$FiltrationTracker.apply(BTree.java:650)	at org.apache.cassandra.utils.btree.BTree.transformAndFilter(BTree.java:693)	at org.apache.cassandra.utils.btree.BTree.transformAndFilter(BTree.java:668)	at org.apache.cassandra.db.rows.BTreeRow.transformAndFilter(BTreeRow.java:338)	at org.apache.cassandra.db.rows.BTreeRow.purge(BTreeRow.java:333)	at org.apache.cassandra.db.partitions.PurgeFunction.applyToRow(PurgeFunction.java:88)	at org.apache.cassandra.db.transform.BaseRows.hasNext(BaseRows.java:116)	at org.apache.cassandra.db.rows.UnfilteredRowIteratorSerializer.serialize(UnfilteredRowIteratorSerializer.java:133)	at org.apache.cassandra.db.rows.UnfilteredRowIteratorSerializer.serialize(UnfilteredRowIteratorSerializer.java:89)	at org.apache.cassandra.db.rows.UnfilteredRowIteratorSerializer.serialize(UnfilteredRowIteratorSerializer.java:79)	at org.apache.cassandra.db.partitions.UnfilteredPartitionIterators$Serializer.serialize(UnfilteredPartitionIterators.java:294)	at org.apache.cassandra.db.ReadResponse$LocalDataResponse.build(ReadResponse.java:134)	at org.apache.cassandra.db.ReadResponse$LocalDataResponse.(ReadResponse.java:127)	at org.apache.cassandra.db.ReadResponse$LocalDataResponse.(ReadResponse.java:123)	at org.apache.cassandra.db.ReadResponse.createDataResponse(ReadResponse.java:65)	at org.apache.cassandra.db.ReadCommand.createResponse(ReadCommand.java:292)	at org.apache.cassandra.db.ReadCommandVerbHandler.doVerb(ReadCommandVerbHandler.java:50)	at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:64)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)	at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136)	at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)	at java.lang.Thread.run(Thread.java:745)