Unable to Login or Search for User in RH-SSO (ERROR: invalid byte sequence)

Issue

• Searching for users in the RH-SSO admin console, results in the following error:

  DEBUG [org.keycloak.storage.ldap.LDAPStorageProvider] Imported new user from LDAP to Keycloak DB. Username: [user1], Email: [user1@example.com], LDAP_ID: [....], LDAP Entry DN: [cn=user1,ou=xxxx,ou=xxxx,ou=xxxx,o=xxxx]
  ...
  DEBUG [org.keycloak.transaction.JtaTransactionWrapper] JtaTransactionWrapper  commit
  WARN  [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] SQL Error: 0, SQLState: 22021
  ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] ERROR: invalid byte sequence for encoding "UTF8": 0x00
  ERROR [org.hibernate.internal.ExceptionMapperStandardImpl] HHH000346: Error during managed flush [org.hibernate.exception.DataException: could not execute statement]
  WARN  [com.arjuna.ats.arjuna] ARJUNA012125: TwoPhaseCoordinator.beforeCompletion - failed for SynchronizationImple< 0:ffff0ab0f04d:7b233f4a:5e8c285a:15eb4b, org.wildfly.transaction.client.AbstractTransaction$AssociatingSynchronization@44be1dd5 >: javax.persistence.PersistenceException: org.hibernate.exception.DataException: could not execute statement
  ...
  Caused by: org.postgresql.util.PSQLException: ERROR: invalid byte sequence for encoding "UTF8": 0x00
  

• When user tries to login I see the same behaviour.

• We set the 'UUID LDAP attribute' to 'guid' and this has the following value for the user:
  HEX: 08 9e 03 5c 37 ea ...