java.lang.AssertionError: null

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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 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$7.run(AbstractChannelHandlerContext.java:283)
at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
at java.lang.Thread.run(Thread.java:745)

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