Replication NullPointer at SyncReplRequestHandler.java:648

Hi
we have some problems with SyncRepl. Following Apache documentation we set up two instances of embedded ApacheDs M19.
In the provider we have:
val replRequestHandler = new SyncReplRequestHandler()
server.setReplicationReqHandler(replRequestHandler)
in the consumer:
val replicationConf = new SyncReplConfiguration
replicationConf.setRemoteHost("localhost")
replicationConf.setRemotePort(1389)
replicationConf.setUseTls(false)
replicationConf.setReplUserDn("uid=admin,ou=system")
replicationConf.setReplUserPassword("secret".getBytes)
replicationConf.setBaseDn(“o=myDn”) //replaced
replicationConf.setFilter("(objectClass=*)")
replicationConf.setRefreshInterval(60000)
replicationConf.setRefreshNPersist(true)
replicationConf.setAliasDerefMode(AliasDerefMode.NEVER_DEREF_ALIASES)
val consumer: ReplicationConsumer = new ReplicationConsumerImpl()
consumer.setConfig(replicationConf)
server.setReplConsumers(ApacheDSUtils.buildConsumers(consumer))
When we run both the server we get this error:
org.apache.directory.api.ldap.model.exception.LdapException: java.lang.RuntimeException: java.lang.NullPointerException
at org.apache.directory.server.core.shared.DefaultCoreSession.search(DefaultCoreSession.java:1157) ~[apacheds-all-2.0.0-M19.jar:2.0.0-M19]
at org.apache.directory.server.ldap.replication.provider.SyncReplRequestHandler.doSimpleSearch(SyncReplRequestHandler.java:648) ~[apacheds-all-2.0.0-M19.jar:2.0.0-M19]
at org.apache.directory.server.ldap.replication.provider.SyncReplRequestHandler.doInitialRefresh(SyncReplRequestHandler.java:562) ~[apacheds-all-2.0.0-M19.jar:2.0.0-M19]
at org.apache.directory.server.ldap.replication.provider.SyncReplRequestHandler.handleSyncRequest(SyncReplRequestHandler.java:311) ~[apacheds-all-2.0.0-M19.jar:2.0.0-M19]
at org.apache.directory.server.ldap.handlers.request.SearchRequestHandler.handleReplication(SearchRequestHandler.java:240) [apacheds-all-2.0.0-M19.jar:2.0.0-M19]
Note: when I use a more specific filter for example: cn=someCn it works fine.
Any idea?
Thanks

ps: sorry not sure where to open this issue and I also opened DIR-319