Install failed Multiple primary key defined query: ALTER TABLE epublish_edition

upgrade from epublish 5.x-1.2 to 6.x-1.15

Failed: ALTER TABLE {epublish_edition} CHANGE `eid` `eid` INT NOT NULL auto_increment, ADD PRIMARY KEY (eid), ADD INDEX pid (pid)

user warning: Multiple primary key defined query: ALTER TABLE epublish_edition CHANGE `eid` `eid` INT NOT NULL auto_increment, ADD PRIMARY KEY (eid), ADD INDEX pid (pid)