AgendaOperationsTest failure on PostgreSQL

org.nuxeo.ecm.core.api.ConcurrentUpdateException: java.sql.BatchUpdateException: Batch entry 4 INSERT INTO "hierarchy" ("id", "parentid", "pos", "name", "isproperty", "primarytype", "mixintypes", "ischeckedin", "baseversionid", "majorversion", "minorversion", "isversion", "systemchangetoken", "changetoken") VALUES ('e36b4801-c474-4725-9f0d-19fb4183ecd5', 'e8ee3b63-5bed-41a4-b986-16eb047933e0', NULL, 'null.1506783917550', 'FALSE', 'VEVENT', NULL, NULL, NULL, 0, 0, NULL, 0, 0) was aborted: ERROR: duplicate key value violates unique constraint "hierarchy_unique_child"
  Detail: Key (parentid, name)=(e8ee3b63-5bed-41a4-b986-16eb047933e0, null.1506783917550) already exists.  Call getNextException to see other errors in the batch.
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCConnection.checkConcurrentUpdate(JDBCConnection.java:184)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCRowMapper.insertSimpleRows(JDBCRowMapper.java:561)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCRowMapper.writeCreates(JDBCRowMapper.java:471)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCRowMapper.write(JDBCRowMapper.java:444)
	at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapperConnector.doInvoke(JDBCMapperConnector.java:111)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapperConnector.lambda$doConnectAndInvoke$0(JDBCMapperConnector.java:98)
	at org.nuxeo.runtime.transaction.TransactionHelper.runInTransaction(TransactionHelper.java:589)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapperConnector.doConnectAndInvoke(JDBCMapperConnector.java:95)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapperConnector.invoke(JDBCMapperConnector.java:84)
	at com.sun.proxy.$Proxy45.write(Unknown Source)
	at org.nuxeo.ecm.core.storage.sql.SoftRefCachingRowMapper.write(SoftRefCachingRowMapper.java:360)
	at org.nuxeo.ecm.core.storage.sql.SessionImpl.doFlush(SessionImpl.java:369)
	at org.nuxeo.ecm.core.storage.sql.SessionImpl.flush(SessionImpl.java:342)
	at org.nuxeo.ecm.core.storage.sql.SessionImpl.end(SessionImpl.java:1464)
	at org.apache.geronimo.transaction.manager.WrapperNamedXAResource.end(WrapperNamedXAResource.java:61)
	at org.apache.geronimo.transaction.manager.TransactionImpl.endResources(TransactionImpl.java:569)
	at org.apache.geronimo.transaction.manager.TransactionImpl.endResources(TransactionImpl.java:548)
	at org.apache.geronimo.transaction.manager.TransactionImpl.beforePrepare(TransactionImpl.java:408)
	at org.apache.geronimo.transaction.manager.TransactionImpl.commit(TransactionImpl.java:255)
	at org.apache.geronimo.transaction.manager.TransactionManagerImpl.commit(TransactionManagerImpl.java:252)
	at org.nuxeo.runtime.jtajca.NuxeoContainer$UserTransactionImpl.commit(NuxeoContainer.java:539)
	at org.nuxeo.runtime.transaction.TransactionHelper.commitOrRollbackTransaction(TransactionHelper.java:363)
	at org.nuxeo.ecm.agenda.operations.AgendaOperationsTest.testListEventsWithLimit(AgendaOperationsTest.java:144)