Why am I getting this error?

When I try to syncronize before quitting, I am getting the following error:

IncorrectResultSizeDataAccessException: result returns more than one elements; nested exception is javax.persistence.NonUniqueResultException: result returns more than one elements : An internal problem has occured while processing your request [requestId = null]. Please try after some time.

I've run Super validate on my data, and it is consistently repeating when I shut down.

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