[keycloak-user] Duplicate entry for key

Dear all, I often have this error: keycloak_1_c37c1c45aa45 | 12:28:02,524 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-10) Uncaught server error: org.keycloak.models.ModelDuplicateException: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement ... keycloak_1_c37c1c45aa45 | Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'GW1-d9d54300-3791-443c-884c-0c52c43d64db-0892e431-5daf-413e-b4cf' for key 'UK_FRSR6T700S9V50BU18WS5HA6' For instance, I have this error when trying to create a resource. What does it mean? How to solve it? Thanks Corentin