Error:
TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
gdprconsent.dao.ConsentStatusDAOImpl$AjcClosure19.run(ConsentStatusDAOIm
pl.java:1)
This is due to duplicate GDPR (General Data Protection Regulation) consent statuses, one cause of this is a known bug around the person merge which was fixed in Mosaic 21.1.0.0 (release notes reference CORM-18028).
This issue may also be related to users logging in twice from separate browsers, which is not supported by Mosaic.
We have also seen similar errors where the person has not been involved in a merge.
If you encounter this issue, please raise a new case online and reference the title of this article.