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java.lang.AssertionError: null	at org.apache.cassandra.db.rows.BTreeRow.getCell(BTreeRow.java:212)	at org.apache.cassandra.db.SinglePartitionReadCommand.canRemoveRow(SinglePartitionReadCommand.java:899)	at org.apache.cassandra.db.SinglePartitionReadCommand.reduceFilter(SinglePartitionReadCommand.java:863)	at org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndSSTablesInTimestampOrder(SinglePartitionReadCommand.java:748)	at org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDiskInternal(SinglePartitionReadCommand.java:519)	at org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDisk(SinglePartitionReadCommand.java:496)	at org.apache.cassandra.db.SinglePartitionReadCommand.queryStorage(SinglePartitionReadCommand.java:358)	at org.apache.cassandra.db.ReadCommand.executeLocally(ReadCommand.java:366)	at org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:1797)	at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2466)	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$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136)	at org.apache.cassandra.concurrent.SEPExecutor.maybeExecuteImmediately(SEPExecutor.java:192)	at org.apache.cassandra.service.AbstractReadExecutor.makeRequests(AbstractReadExecutor.java:117)	at org.apache.cassandra.service.AbstractReadExecutor.makeDataRequests(AbstractReadExecutor.java:85)	at org.apache.cassandra.service.AbstractReadExecutor$NeverSpeculatingReadExecutor.executeAsync(AbstractReadExecutor.java:214)	at org.apache.cassandra.service.StorageProxy$SinglePartitionReadLifecycle.doInitialQueries(StorageProxy.java:1702)	at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:1657)	at org.apache.cassandra.service.StorageProxy.readRegular(StorageProxy.java:1604)	at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:1523)	at org.apache.cassandra.db.SinglePartitionReadCommand.execute(SinglePartitionReadCommand.java:335)	at org.apache.cassandra.service.pager.AbstractQueryPager.fetchPage(AbstractQueryPager.java:67)	at org.apache.cassandra.service.pager.SinglePartitionPager.fetchPage(SinglePartitionPager.java:34)	at org.apache.cassandra.cql3.statements.SelectStatement$Pager$NormalPager.fetchPage(SelectStatement.java:325)	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:361)	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:237)	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:78)	at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:208)	at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:486)	at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:463)	at org.apache.cassandra.transport.messages.ExecuteMessage.execute(ExecuteMessage.java:130)	at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507)	at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401)	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)	at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32)	at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)	at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)	at java.lang.Thread.run(Thread.java:745)