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java.lang.NullPointerException: null	at org.apache.cassandra.service.ActiveRepairService$ParentRepairSession.getActiveSSTables(ActiveRepairService.java:495)	at org.apache.cassandra.service.ActiveRepairService$ParentRepairSession.access$300(ActiveRepairService.java:451)	at org.apache.cassandra.service.ActiveRepairService.currentlyRepairing(ActiveRepairService.java:338)	at org.apache.cassandra.db.compaction.CompactionManager.getSSTablesToValidate(CompactionManager.java:1320)