SQL Directory concurrent updates should be detected

2016-01-20 14:30:17,047 ERROR [Nuxeo-Work-blobProviderDocumentUpdate-2] [org.nuxeo.ecm.core.work.WorkManagerImpl] Uncaught error on thread Nuxeo-Work-blobProviderDocumentUpdate-2
org.nuxeo.ecm.directory.DirectoryException: updateEntry failed for 4
        at org.nuxeo.ecm.directory.sql.SQLSession.updateEntry(SQLSession.java:549)
        at org.nuxeo.ecm.platform.oauth2.tokens.OAuth2TokenStore.refresh(OAuth2TokenStore.java:192)
        at org.nuxeo.ecm.platform.oauth2.tokens.OAuth2TokenStore.set(OAuth2TokenStore.java:73)
        at org.nuxeo.ecm.platform.oauth2.tokens.OAuth2TokenStore.set(OAuth2TokenStore.java:50)
        at com.google.api.client.auth.oauth2.DataStoreCredentialRefreshListener.makePersistent(DataStoreCredentialRefreshListener.java:94)
        at com.google.api.client.auth.oauth2.DataStoreCredentialRefreshListener.onTokenResponse(DataStoreCredentialRefreshListener.java:79)
        at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:493)
        at com.google.api.client.auth.oauth2.Credential.intercept(Credential.java:217)
        at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:859)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
        at org.nuxeo.ecm.liveconnect.google.drive.GoogleDriveBlobProvider.executeAndCache(GoogleDriveBlobProvider.java:566)
        at org.nuxeo.ecm.liveconnect.google.drive.GoogleDriveBlobProvider.getDriveFile(GoogleDriveBlobProvider.java:531)
        at org.nuxeo.ecm.liveconnect.google.drive.GoogleDriveBlobProvider.retrieveFile(GoogleDriveBlobProvider.java:510)
        at org.nuxeo.ecm.liveconnect.core.AbstractLiveConnectBlobProvider.checkChangesAndUpdateBlob(AbstractLiveConnectBlobProvider.java:120)
        at org.nuxeo.ecm.liveconnect.update.worker.BlobProviderDocumentsUpdateWork.work(BlobProviderDocumentsUpdateWork.java:72)
        at org.nuxeo.ecm.core.work.AbstractWork.runWorkWithTransaction(AbstractWork.java:416)
        at org.nuxeo.ecm.core.work.AbstractWork.runWorkWithTransactionAndCheckExceptions(AbstractWork.java:377)
        at org.nuxeo.ecm.core.work.AbstractWork.run(AbstractWork.java:338)
        at org.nuxeo.ecm.core.work.WorkHolder.run(WorkHolder.java:54)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.postgresql.util.PSQLException: ERROR: deadlock detected
  Detail: Process 14731 waits for ShareLock on transaction 6103293; blocked by process 14727.
Process 14727 waits for ShareLock on transaction 6103294; blocked by process 14731.
  Hint: See server log for query details.
        at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:410)
        at org.tranql.connector.jdbc.PreparedStatementHandle.execute(PreparedStatementHandle.java:177)
        at org.nuxeo.ecm.directory.sql.SQLSession.updateEntry(SQLSession.java:547)
        ... 22 more