That will not happen if there is inconsistency in between both the servers.
Please refer to the discussions on the link provided in the first post:
http://www.postgresql.org/message-id/CAF8Q-Gxg3PQTf71NVECe-6OzRaew5pWhk7yQtbJgWrFu513s+Q@mail.gmail.com
Regards,
Samrat Revgade