After adding nodes to aerospike we are facing below NPE in scans

aerospike-server-community 3.15.1.3-1

client version 3.3.0

ERROR [2018-06-19 08:59:12,331] [pool-42-thread-1] [SecondaryStorageCommands]: Error while reading all seooi com.aerospike.client.AerospikeException: java.lang.NullPointerException at com.aerospike.client.command.Executor.execute(Executor.java:64) at com.aerospike.client.AerospikeClient.scanAll(AerospikeClient.java:742) at com.phonepe.ps.oe.server.commands.data.SecondaryStorageCommands.loadAllseooiFromSecondaryStore(SecondaryStorageCommands.java:307) at com.phonepe.ps.oe.server.commands.data.SecondaryStorageCommands.loadAllValidseooiFromSecondaryStore(SecondaryStorageCommands.java:270) at com.phonepe.ps.oe.server.refresher.Refresher$CacheReloader.run(Refresher.java:73) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NullPointerException: null at com.phonepe.ps.oe.server.commands.data.SecondaryStorageCommands$seooiCallback.scanCallback(SecondaryStorageCommands.java:751) at com.aerospike.client.command.ScanCommand.parseRow(ScanCommand.java:73) at com.aerospike.client.command.MultiCommand.parseGroup(MultiCommand.java:114) at com.aerospike.client.command.MultiCommand.parseResult(MultiCommand.java:71) at com.aerospike.client.command.SyncCommand.execute(SyncCommand.java:60) at com.aerospike.client.command.Executor$ExecutorThread.run(Executor.java:127) … 3 common frames omitted