When we are keeping the session open for a while and getting the following exception

Missing stream key property pyStreamName

at com.pega.pegarules.session.internal.mgmt.Executable.getStream(Executable.java:3963)
at com.pega.pegarules.session.internal.mgmt.Executable.getStream(Executable.java:3914)
at com.pegarules.generated.html.ra_stream_reloadsection_b3c6bd69d6e59b57d12301f19f2611e2.execute(ra_stream_reloadsection_b3c6bd69d6e59b57d12301f19f2611e2.java:201)
at com.pega.pegarules.session.internal.mgmt.Executable.getStream(Executable.java:4086)
at com.pega.pegarules.session.internal.mgmt.Executable.getStream(Executable.java:3914)
at com.pega.pegarules.pub.runtime.AbstractActivity.showHtml(AbstractActivity.java:247)
at com.pegarules.generated.activity.ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.step9_circum0(ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.java:961)
at com.pegarules.generated.activity.ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.perform(ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.java:206)
at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3553)
at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:646)
at com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivitiesAlt(PRThreadImpl.java:465)
at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.runActivities(HttpAPI.java:3203)
at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(EngineAPI.java:391)
at sun.reflect.GeneratedMethodAccessor237.invoke(Unknown:Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1297)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1034)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:889)
at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(EngineAPI.java:331)
at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke(HttpAPI.java:829)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:331)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:274)
at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225)
at sun.reflect.GeneratedMethodAccessor166.invoke(Unknown:Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBo

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