DefaultConfigFactory attempts to create VBucket with master == -1

Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.get(ArrayList.java:324)
at com.couchbase.client.vbucket.config.DefaultConfig.getServer(DefaultConfig.java:81)
at com.couchbase.client.vbucket.VBucketNodeLocator.getPrimary(VBucketNodeLocator.java:74)
at com.couchbase.client.CouchbaseConnection.addOperation(CouchbaseConnection.java:140)
at net.spy.memcached.MemcachedConnection.enqueueOperation(MemcachedConnection.java:639)
at net.spy.memcached.MemcachedClient.asyncStore(MemcachedClient.java:296)
at net.spy.memcached.MemcachedClient.set(MemcachedClient.java:727)
at net.spy.memcached.MemcachedClient.set(MemcachedClient.java:125)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)

Possible steps to reproduce:
1) populate bucket from load file
2) delete bucket
3) create new bucket with same name
4) repopulate bucket with same keys, same order, slightly different values

The -1 value looks like it is being set when the VBucket object is created. Would it make sense to check for illegal arguments in the constructor and make the object immutable, i.e. no setMaster?