ERROR: prepared transaction does not exist in postgresql

I am getting following error in PostgreSQL (9.2) log while running Java EE application with JPA over Hibernate:

ERROR: prepared transaction with identifier "131077_AAAAAAAAAAAAAP//fwAAAd5tKPBVp1XeAAAzfmx0Y2hpZS1ub2Rl_AAAAAAAAAAAAAP//fwAAAd5tKPBVp1XeAAAzpwAAAAAAAAAA" does not exist STATEMENT: ROLLBACK PREPARED '131077_AAAAAAAAAAAAAP//fwAAAd5tKPBVp1XeAAAzfmx0Y2hpZS1ub2Rl_AAAAAAAAAAAAAP//fwAAAd5tKPBVp1XeAAAzpwAAAAAAAAAA'

How can I optimize settings to avoid this error? This occurs intermittently.