ERROR com.appiancorp.kougar.mapper.AbstractConversionMap - Error notifying listener of tracked changes

We are seeing the below error in our logs. Wondering if anyone knows what may be causing this? I saw one other reference to this error on forum from 2015, but there were no responses.

2016-12-07 14:06:52,216 [Appian EmailHandlerBean - 4460] ERROR com.appiancorp.kougar.mapper.AbstractConversionMap - Error notifying listener of tracked changes [l=com.appiancorp.ix.analysis.IaKTrackedChangesListener, changes=[KTxnMetadata [id=906598, ts=2016-12-07 14:06:52.21, ops=[KTxnOp [op=UPSERT, refs=[KTypedRef [type=13, uuid=_a-0000de00-6529-8000-5130-010000010000_725235], KTypedRef [type=13, uuid=_a-0000de00-6529-8000-5130-010000010000_725236], KTypedRef [type=13, uuid=_a-0000de00-6529-8000-5130-010000010000_725237]]]]]]]
org.springframework.orm.jpa.JpaSystemException: org.hibernate.TransactionException: JD...

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  • ...BC commit failed; nested exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC commit failed
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:321)
    at org.springframework.orm.jpa.DefaultJpaDialect.translateExceptionIfPossible(DefaultJpaDialect.java:120)
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:516)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:147)
    at com.appiancorp.common.config.persis...
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  • ...BC commit failed; nested exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC commit failed
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:321)
    at org.springframework.orm.jpa.DefaultJpaDialect.translateExceptionIfPossible(DefaultJpaDialect.java:120)
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:516)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:147)
    at com.appiancorp.common.config.persis...
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