Fatal exception in thread Thread[MigrationStage:1,5,main] (LeveledCompaction)

ERROR 19:29:39,712 Fatal exception in thread Thread[MigrationStage:1,5,main]
java.lang.AssertionError
at org.apache.cassandra.db.compaction.LeveledManifest.promote(LeveledManifest.java:156)
at org.apache.cassandra.db.compaction.LeveledCompactionStrategy.handleNotification(LeveledCompactionStrategy.java:141)
at org.apache.cassandra.db.DataTracker.notifySSTablesChanged(DataTracker.java:488)
at org.apache.cassandra.db.DataTracker.removeAllSSTables(DataTracker.java:257)
at org.apache.cassandra.db.ColumnFamilyStore.invalidate(ColumnFamilyStore.java:267)
at org.apache.cassandra.db.Table.unloadCf(Table.java:361)
at org.apache.cassandra.db.Table.dropCf(Table.java:343)
at org.apache.cassandra.db.migration.DropColumnFamily.applyModels(DropColumnFamily.java:87)
at org.apache.cassandra.db.migration.Migration.apply(Migration.java:156)
at org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:73)
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)