Agent is trying to process the request (Resume Flow) and after few requests are processed the agent is down with below exception message. Can anyone let me know the resolution for this issue?

Exception at 20181009T190558.216 GMT: com.pega.pegarules.pub.runtime.IndeterminateConditionalException: ** in RULE-OBJ-WHEN @BASECLASS HASMESSAGES #20130918T235432.414 GMT: null at com.pega.pegarules.priv.FUAUtil.activityPreTranIndeterminateConditionalCheck(FUAUtil.java:438) at com.pegarules.generated.activity.ra_action_updatewsqrecord_b92be110d58ffbee3f3054a11c1d4ab1.step5_circum0(ra_action_updatewsqrecord_b92be110d58ffbee3f3054a11c1d4ab1.java:646) at com.pegarules.generated.activity.ra_action_updatewsqrecord_b92be110d58ffbee3f3054a11c1d4ab1.perform(ra_action_updatewsqrecord_b92be110d58ffbee3f3054a11c1d4ab1.java:161) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3265) at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10177) at com.pegarules.generated.activity.ra_action_processwsqmessages_e7668c0be9e292d12beb9ec3cfbb5c31.step3_12_circum0(ra_action_processwsqmessages_e7668c0be9e292d12beb9ec3cfbb5c31.java:1516) at com.pegarules.generated.activity.ra_action_processwsqmessages_e7668c0be9e292d12beb9ec3cfbb5c31.step3_0_circum0(ra_action_processwsqmessages_e7668c0be9e292d12beb9ec3cfbb5c31.java:620) at com.pegarules.generated.activity.ra_action_processwsqmessages_e7668c0be9e292d12beb9ec3cfbb5c31.perform(ra_action_processwsqmessages_e7668c0be9e292d12beb9ec3cfbb5c31.java:115) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3265) at com.pega.pegarules.session.internal.async.agent.QueueProcessor.runActivity(QueueProcessor.java:721) at com.pega.pegarules.session.internal.async.agent.QueueProcessor.execute(QueueProcessor.java:602) at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:884) at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1192) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:930) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:829) at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:617) at com.pega.pegarules.session.internal.async.Agent.queueBatchActivityForAgent(Agent.java:1461) at com.pega.pegarules.session.internal.async.Agent.queueBatchActivityForAgent(Agent.java:1250) at com.pega.pegarules.session.internal.async.AgentQueue.run(AgentQueue.java:740) at com.pega.pegarules.session.internal.async.Agent.runAgentTask(Agent.java:905) at com.pega.pegarules.session.internal.engineinterface.etier.impl.AsyncServant.processAsyncTask(AsyncServant.java:192) at com.pega.pegarules.session.internal.engineinterface.etier.impl.AsyncServant.invoke(AsyncServant.java:152) at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:312) at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:263) at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56) at java.lang.reflect.Method.invoke(Method.java:620) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:419) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:460) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingException(PRBootstrap.java:482) at com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.invokeEngine(EngineBeanBoot.java:168) at com.pega.pegarules.internal.etier.interfaces.EJSLocalStatelessEngineBMT_f2439d86.invokeEngine(Unknown Source) at com.pega.pegarules.session.internal.engineinterface.etier.mdb.PRAsync.processRequest(PRAsync.java:153) at com.pega.pegarules.session.internal.engineinterface.etier.asynchbeans.AsyncTask.run(AsyncTask.java:64) at com.pega.pegarules.session.internal.engineinterface.etier.asynchbeans.RunnableWrapper.run(RunnableWrapper.java:71) at com.ibm.ws.asynchbeans.J2EEContext$RunProxy.run(J2EEContext.java:271) at java.security.AccessController.doPrivileged(AccessController.java:396) at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:797) at com.ibm.ws.asynchbeans.WorkWithExecutionContextImpl.go(WorkWithExecutionContextImpl.java:222) at com.ibm.ws.asynchbeans.ABWorkItemImpl.run(ABWorkItemImpl.java:206) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1892)