Hi

We have upgraded our application to 8.51. One of the workflow after resolving the case the screen throws 

Error

There has been an issue; please consult your system administrator

In that session everytime the case is opened we get the same error. If we log out and login and open the case no issue. Below is the log we see during error. Please assist.

java.lang.NullPointerException 
java.lang.NullPointerException: null 
	at com.pega.pegarules.session.internal.mgmt.authentication.ConstellationURLUtils.isConstellationApplication(ConstellationURLUtils.java:55) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.mgmt.authentication.ConstellationURLUtils.shouldRejectRequest(ConstellationURLUtils.java:83) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.checkForTamperingOfQueryParametersinConstellation(HttpAPI.java:7643) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.withLockSetup(HttpAPI.java:2758) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(EngineAPI.java:427) ~[prenginext.jar:?] 
	at sun.reflect.GeneratedMethodAccessor177.invoke(Unknown Source) ~[?:?] 
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275] 
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275] 
	at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1399) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1131) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:985) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(EngineAPI.java:368) ~[prenginext.jar:?] 
	at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke(HttpAPI.java:929) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:338) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:282) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:259) ~[prprivate-session.jar:?] 
	at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngineInner(JNDIEnvironment.java:281) ~[prpublic.jar:?] 
	at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngine(JNDIEnvironment.java:226) ~[prpublic.jar:?] 
	at com.pega.pegarules.web.impl.WebStandardImpl.makeEtierRequest(WebStandardImpl.java:775) ~[prwebj2ee.jar:?] 
	at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:424) ~[prwebj2ee.jar:?] 
	at sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source) ~[?:?] 
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275] 
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275] 
	at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:388) ~[prbootstrap-8.5.1-208.jar:8.5.1-208] 
	at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:430) ~[prbootstrap-8.5.1-208.jar:8.5.1-208] 
	at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:225) ~[prbootstrap-api-8.5.1-208.jar:8.5.1-208] 
	at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:274) ~[prbootstrap-api-8.5.1-208.jar:8.5.1-208] 
	at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:146) ~[prbootstrap-api-8.5.1-208.jar:8.5.1-208] 
	at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:107) ~[prbootstrap-api-8.5.1-208.jar:8.5.1-208] 
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[servlet-api.jar:?] 
	at com.pega.pegarules.internal.web.servlet.WebStandardBoot.service(WebStandardBoot.java:172) ~[prbootstrap-api-8.5.1-208.jar:8.5.1-208] 
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[servlet-api.jar:?] 
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.57] 
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-websocket.jar:8.5.57] 
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) ~[catalina.jar:8.5.57] 
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[catalina.jar:8.5.57] 
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:615) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.doRun(Nio2Endpoint.java:1620) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.AbstractEndpoint.processSocket(AbstractEndpoint.java:1082) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.Nio2Endpoint$Nio2SocketWrapper$2.completed(Nio2Endpoint.java:565) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.Nio2Endpoint$Nio2SocketWrapper$2.completed(Nio2Endpoint.java:543) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.SecureNio2Channel$1.completed(SecureNio2Channel.java:969) ~[tomcat-coyote.jar:8.5.57] 
	at org.apache.tomcat.util.net.SecureNio2Channel$1.completed(SecureNio2Channel.java:898) ~[tomcat-coyote.jar:8.5.57] 
	at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126) ~[?:1.8.0_275] 
	at sun.nio.ch.Invoker$2.run(Invoker.java:218) ~[?:1.8.0_275] 
	at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112) ~[?:1.8.0_275] 
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_275] 
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_275] 
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-util.jar:8.5.57] 
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_275]