Hbase incremental backup fails with null pointer exception

hbase backup create incremental hdfs:///bkpHbase_Test/bkpHbase_Test2 -t bkpHbase_Test2
2018-09-21 15:35:31,421 INFO [main] impl.TableBackupClient: Backup backup_1537524313995 started at 1537524331419. 2018-09-21 15:35:31,454 INFO [main] impl.IncrementalBackupManager: Execute roll log procedure for incremental backup ... 2018-09-21 15:35:32,985 ERROR [main] impl.TableBackupClient: Unexpected Exception : java.lang.NullPointerException java.lang.NullPointerException at org.apache.hadoop.hbase.backup.impl.IncrementalBackupManager.getLogFilesForNewBackup(IncrementalBackupManager.java:309) at org.apache.hadoop.hbase.backup.impl.IncrementalBackupManager.getIncrBackupLogFileMap(IncrementalBackupManager.java:103) at org.apache.hadoop.hbase.backup.impl.IncrementalTableBackupClient.execute(IncrementalTableBackupClient.java:276) at org.apache.hadoop.hbase.backup.impl.BackupAdminImpl.backupTables(BackupAdminImpl.java:601) at org.apache.hadoop.hbase.backup.impl.BackupCommands$CreateCommand.execute(BackupCommands.java:347) at org.apache.hadoop.hbase.backup.BackupDriver.parseAndRun(BackupDriver.java:138) at org.apache.hadoop.hbase.backup.BackupDriver.doWork(BackupDriver.java:171) at org.apache.hadoop.hbase.backup.BackupDriver.run(BackupDriver.java:204) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.hbase.backup.BackupDriver.main(BackupDriver.java:179) 2018-09-21 15:35:32,989 ERROR [main] impl.TableBackupClient: BackupId=backup_1537524313995,startts=1537524331419,failedts=1537524332989,failedphase=PREPARE_INCREMENTAL,failedmessage=null 2018-09-21 15:35:57,167 ERROR [main] impl.TableBackupClient: Backup backup_1537524313995 failed.

Backup session finished. Status: FAILURE 2018-09-21 15:35:57,175 ERROR [main] backup.BackupDriver: Error running

command-line tool java.io.IOException: java.lang.NullPointerException at org.apache.hadoop.hbase.backup.impl.IncrementalTableBackupClient.execute(IncrementalTableBackupClient.java:281) at org.apache.hadoop.hbase.backup.impl.BackupAdminImpl.backupTables(BackupAdminImpl.java:601) at org.apache.hadoop.hbase.backup.impl.BackupCommands$CreateCommand.execute(BackupCommands.java:347) at org.apache.hadoop.hbase.backup.BackupDriver.parseAndRun(BackupDriver.java:138) at org.apache.hadoop.hbase.backup.BackupDriver.doWork(BackupDriver.java:171) at org.apache.hadoop.hbase.backup.BackupDriver.run(BackupDriver.java:204) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.hbase.backup.BackupDriver.main(BackupDriver.java:179) Caused by: java.lang.NullPointerException at org.apache.hadoop.hbase.backup.impl.IncrementalBackupManager.getLogFilesForNewBackup(IncrementalBackupManager.java:309) at org.apache.hadoop.hbase.backup.impl.IncrementalBackupManager.getIncrBackupLogFileMap(IncrementalBackupManager.java:103) at org.apache.hadoop.hbase.backup.impl.IncrementalTableBackupClient.execute(IncrementalTableBackupClient.java:276) ... 7 more