Cassandra stacktrace when deleting/re-creating "missing" keyspaces.

gistfile1.txt

 INFO 15:33:43,505 Enqueuing flush of Memtable-schema_keyspaces@1108352425(192/240 serialized/live bytes, 4 ops)
 INFO 15:33:43,505 Writing Memtable-schema_keyspaces@1108352425(192/240 serialized/live bytes, 4 ops)
 INFO 15:33:43,512 Completed flushing /var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hc-36-Data.db (256 bytes)
 INFO 15:33:43,513 Compacting [SSTableReader(path='/var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hc-34-Data.db'), SSTableReader(path='/var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hc-35-Data.db'), SSTableReader(path='/var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hc-36-Data.db'), SSTableReader(path='/var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hc-33-Data.db')]
 INFO 15:33:43,524 Compacted to [/var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hc-37-Data.db,].  1,498 to 730 (~48% of original) bytes for 3 keys at 0.069618MB/s.  Time: 10ms.
ERROR 15:33:43,525 Exception in thread Thread[MigrationStage:1,5,main]
java.lang.AssertionError
	at org.apache.cassandra.db.DefsTable.updateKeyspace(DefsTable.java:441)
	at org.apache.cassandra.db.DefsTable.mergeKeyspaces(DefsTable.java:339)
	at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:269)
	at org.apache.cassandra.service.MigrationManager$1.call(MigrationManager.java:214)
	at java.util.concurrent.FutureTask$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:680)
ERROR 15:33:43,525 Error occurred during processing of message.
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.AssertionError
	at org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:372)
	at org.apache.cassandra.service.MigrationManager.announce(MigrationManager.java:191)
	at org.apache.cassandra.service.MigrationManager.announceNewKeyspace(MigrationManager.java:129)
	at org.apache.cassandra.thrift.CassandraServer.system_add_keyspace(CassandraServer.java:987)
	at org.apache.cassandra.thrift.Cassandra$Processor$system_add_keyspace.getResult(Cassandra.java:3370)
	at org.apache.cassandra.thrift.Cassandra$Processor$system_add_keyspace.getResult(Cassandra.java:3358)
	at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:32)
	at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:34)
	at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:186)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:680)
Caused by: java.util.concurrent.ExecutionException: java.lang.AssertionError
	at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
	at java.util.concurrent.FutureTask.get(FutureTask.java:83)
	at org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:368)
	... 11 more
Caused by: java.lang.AssertionError
	at org.apache.cassandra.db.DefsTable.updateKeyspace(DefsTable.java:441)
	at org.apache.cassandra.db.DefsTable.mergeKeyspaces(DefsTable.java:339)
	at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:269)
	at org.apache.cassandra.service.MigrationManager$1.call(MigrationManager.java:214)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	... 3 more