RH-SSO NPE when trying to load OffLine Sessions

Issue

When Keycloak is trying to load OffLine Sessions, at RH-SSO startup , a NPE is generated:

Caused by: java.lang.NullPointerException
at org.keycloak.models.jpa.session.JpaUserSessionPersisterProvider.toAdapter(JpaUserSessionPersisterProvider.java:319)
at org.keycloak.models.jpa.session.JpaUserSessionPersisterProvider.loadUserSessions(JpaUserSessionPersisterProvider.java:278)
at org.keycloak.models.sessions.infinispan.initializer.OfflinePersistentUserSessionLoader.loadSessions(OfflinePersistentUserSessionLoader.java:102)
at org.keycloak.models.sessions.infinispan.initializer.OfflinePersistentUserSessionLoader.loadSessions(OfflinePersistentUserSessionLoader.java:36)
at org.keycloak.models.sessions.infinispan.initializer.SessionInitializerWorker$1.run(SessionInitializerWorker.java:73)
at org.keycloak.models.utils.KeycloakModelUtils.runJobInTransaction(KeycloakModelUtils.java:227)
at org.keycloak.models.sessions.infinispan.initializer.SessionInitializerWorker.call(SessionInitializerWorker.java:69)
at org.keycloak.models.sessions.infinispan.initializer.SessionInitializerWorker.call(SessionInitializerWorker.java:34)
at org.infinispan.commands.read.DistributedExecuteCommand.invokeAsync(DistributedExecuteCommand.java:99)
at org.infinispan.distexec.DefaultExecutorService$LocalDistributedTaskPart.lambda$execute$1(DefaultExecutorService.java:1059)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)