java.lang.AssertionError: null

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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 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)

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