I'm getting the below error (rather "randomly') when loading certain fields of my entities. I don't know where to start looking. Any kind of advice is appreciated.

On DN 5.2 with SQL Server. Let me know if you need more info, thanks.

org.datanucleus.exceptions.NucleusObjectNotFoundException
No such database row
org.datanucleus.store.rdbms.request.FetchRequest#execute(FetchRequest.java:439)
org.datanucleus.store.rdbms.RDBMSPersistenceHandler#fetchObject(RDBMSPersistenceHandler.java:316)
org.datanucleus.state.StateManagerImpl#loadFieldsFromDatastore(StateManagerImpl.java:1542)
org.datanucleus.state.StateManagerImpl#loadUnloadedFieldsInFetchPlan(StateManagerImpl.java:3897)
org.datanucleus.state.StateManagerImpl#isLoaded(StateManagerImpl.java:4112)
domainapp.modules.dcp.dom.quest.dissag.slots.CustomDisaggregationVariableSlot#dnGetdisabled(CustomDisaggregationVariableSlot.java:-1)
domainapp.modules.dcp.dom.quest.dissag.slots.CustomDisaggregationVariableSlot#isDisabled(CustomDisaggregationVariableSlot.java:49)