Automated Error Report: MySQLIntegrityConstraintViolationException: Duplicate entry '117543-160167' for key 'PRIMARY'

Version: 1.9.0 Build 27760
Implementation ID:
User ID: admin
Started Modules: serialization.xstream v0.2.5, logic v0.5.2, reporting v0.7.1.1, patientflags v1.3.4, htmlformentry19ext v0.9, htmlformentry v1.10.0, xforms v4.0.9.5, reportingcompatibility v1.5.7, growthchart v1.7, htmlwidgets v1.6.0

Summary:
org.openmrs.api.db.DAOException: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '117543-160167' for key 'PRIMARY'

Description:
Stack trace:
org.openmrs.api.db.hibernate.HibernateConceptDAO.updateConceptSetDerived(HibernateConceptDAO.java:826)
org.openmrs.api.impl.ConceptServiceImpl.updateConceptSetDerived(ConceptServiceImpl.java:867)
at [ignored] ...
$Proxy522.updateConceptSetDerived(Unknown Source)
at [ignored] ...
org.openmrs.aop.LoggingAdvice.invoke(LoggingAdvice.java:122)
at [ignored] ...
$Proxy523.updateConceptSetDerived(Unknown Source)
at [ignored] ...
$Proxy523.updateConceptSetDerived(Unknown Source)
org.openmrs.web.controller.concept.ConceptSetDerivedFormController.onSubmit(ConceptSetDerivedFormController.java:57)
at [ignored] ...
<snip>

I just tried to run this on the VACCINATIONS concept (concept id 1197) on the demo server and got this error:
could not retrieve snapshot: [org.openmrs.ConceptSetDerived#component[concept,conceptSet]

{concept=org.openmrs.Concept#5261, conceptSet=org.openmrs.Concept#1197}

]