NullPointerException when restoring a snapshot after splitting a region

2018-02-13 01:59:56,033 ERROR [PEWorker-1] procedure.RestoreSnapshotProcedure(403): restore snapshot={ ss=snaptb1-1518454780480 table=testRestoreSnapshotAfterSplittingRegions-1518454780480 type=FLUSH } failed in on-disk restore. Try re-running the restore command.
java.io.IOException
	at org.apache.hadoop.hbase.util.ModifyRegionUtils.editRegions(ModifyRegionUtils.java:222)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreHdfsRegions(RestoreSnapshotHelper.java:424)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreHdfsRegions(RestoreSnapshotHelper.java:227)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreHdfsRegions(RestoreSnapshotHelper.java:177)
	at org.apache.hadoop.hbase.master.procedure.RestoreSnapshotProcedure.restoreSnapshot(RestoreSnapshotProcedure.java:395)
	at org.apache.hadoop.hbase.master.procedure.RestoreSnapshotProcedure.executeFromState(RestoreSnapshotProcedure.java:143)
	at org.apache.hadoop.hbase.master.procedure.RestoreSnapshotProcedure.executeFromState(RestoreSnapshotProcedure.java:58)
	at org.apache.hadoop.hbase.procedure2.StateMachineProcedure.execute(StateMachineProcedure.java:180)
	at org.apache.hadoop.hbase.procedure2.Procedure.doExecute(Procedure.java:845)
	at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.execProcedure(ProcedureExecutor.java:1455)
	at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.executeProcedure(ProcedureExecutor.java:1224)
	at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.access$800(ProcedureExecutor.java:78)
	at org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.run(ProcedureExecutor.java:1734)
Caused by: java.lang.NullPointerException
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreReferenceFile(RestoreSnapshotHelper.java:751)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreStoreFile(RestoreSnapshotHelper.java:675)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreRegion(RestoreSnapshotHelper.java:521)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreRegion(RestoreSnapshotHelper.java:464)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.access$300(RestoreSnapshotHelper.java:116)
	at org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper$2.editRegion(RestoreSnapshotHelper.java:427)
	at org.apache.hadoop.hbase.util.ModifyRegionUtils$2.call(ModifyRegionUtils.java:209)
	at org.apache.hadoop.hbase.util.ModifyRegionUtils$2.call(ModifyRegionUtils.java:206)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)