Exception in Cassandra during Compaction

Exception coming in Debug logs every minute. The other information is that the particular table entries were deleted (not sure if by program error or human error) in  a testbed.

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DEBUG [CompactionExecutor:750] 2018-10-26 21:59:00,512 CompactionTask.java:155 - Compacting (583f8a00-d96a-11e8-9c62-3944322fd453) [/var/lib/cassandra/data/xx/xxt_uuid-35106240c6d511e897e559c5a71f3c3c/mc-4-big-Data.db:level=0, ]
ERROR [CompactionExecutor:750] 2018-10-26 21:59:00,514 CassandraDaemon.java:228 - Exception in thread Thread[CompactionExecutor:750,1,main]
java.lang.NullPointerException: null
at org.apache.cassandra.config.CFMetaData.enforceStrictLiveness(CFMetaData.java:1266) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionIterator$Purger.<init>(CompactionIterator.java:280) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionIterator$Purger.<init>(CompactionIterator.java:264) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionIterator.<init>(CompactionIterator.java:108) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionIterator.<init>(CompactionIterator.java:80) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:177) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:85) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:61) ~[apache-cassandra-3.11.2.jar:3.11.2]
at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:275) ~[apache-cassandra-3.11.2.jar:3.11.2]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_161]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_161]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_161]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]
at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81) [apache-cassandra-3.11.2.jar:3.11.2]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_161]