RH PAM: Could not commit session: java.lang.RuntimeException: Unable to load session snapshot

Issue

• During the execution of a Business Process, the following error log is reported:

08:02:15,826 WARN  [org.drools.persistence.PersistableRunner] (default task-1656) Could not commit session: java.lang.RuntimeException: Unable to load session snapshot
    at deployment.ROOT.war//org.drools.persistence.api.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:104)
    at deployment.ROOT.war//org.drools.persistence.PersistableRunner.initExistingKnowledgeSession(PersistableRunner.java:252)
    at deployment.ROOT.war//org.drools.persistence.PersistableRunner.<init>(PersistableRunner.java:190)
    at jdk.internal.reflect.GeneratedConstructorAccessor262.newInstance(Unknown Source)
    . . .
Caused by: javax.ejb.EJBException: java.lang.RuntimeException: java.lang.NullPointerException
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.tx.BMTInterceptor.handleException(BMTInterceptor.java:83)
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.tx.EjbBMTInterceptor.checkStatelessDone(EjbBMTInterceptor.java:91)
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.tx.EjbBMTInterceptor.handleInvocation(EjbBMTInterceptor.java:106)
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.tx.BMTInterceptor.processInvocation(BMTInterceptor.java:57)
        . . . .
    ... 143 more
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.timerservice.TimerServiceImpl.persistTimer(TimerServiceImpl.java:632)
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.timerservice.TimerServiceImpl.createTimer(TimerServiceImpl.java:480)
    at org.jboss.as.ejb3@7.2.9.GA-redhat-00003//org.jboss.as.ejb3.timerservice.TimerServiceImpl.createSingleActionTimer(TimerServiceImpl.java:305)
    . . ..
    ... 201 more
Caused by: java.lang.NullPointerException
    at deployment.ROOT.war//org.drools.core.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:104)
    at deployment.ROOT.war//org.drools.core.impl.StatefulKnowledgeSessionImpl.writeExternal(StatefulKnowledgeSessionImpl.java:1002)
    at org.jboss.marshalling.river@2.0.9.Final-redhat-00001//org.jboss.marshalling.river.R