2361432 - Error with startpage after SP upgrade

While trying to access the /startPage you are receiving a 500 Internal Server Error on one of the available server nodes.

We can see the below exception in the defaultTrace file:

#Error#com.sap.engine.services.servlets_jsp.ISE500#
com.sap.ASJ.web.000500#BC-JAS-ADM-ADM#sap.com/com.sap.engine.docs.examples#C0000A4E0144003700000006014100D2#5315051000000016#sap.com/com.sap.engine.docs.examples#com.sap.engine.services.servlets_jsp.ISE500#Guest#0##0C6DA34962E911E684E6BEF462ED0B02#0c6da34962e911e684e6bef462ed0b02#D71EE01762E911E68B480000005119EA#0#Thread[HTTP Worker [@787780294],5,Dedicated_Application_Thread]#Plain##

500 Internal Server Error is returned for HTTP request [https://<hostname>:<port>/startPage]:
  component [startPage],
  web module [/],
  application [sap.com/com.sap.engine.docs.examples],
  DC name [sap.com/com.sap.engine.docs.examples],
  CSN component[BC-JAS-ADM-ADM],
  problem categorization [com.sap.ASJ.web.000137],
  internal categorization [-2108066146].

[EXCEPTION]
com.sap.engine.services.servlets_jsp.server.exceptions.WebServletException: Web Container cannot put into service the following class [null].The error is [java.lang.NullPointerException: while trying to invoke the method java.lang.Object.hashCode() of a null object loaded from local variable 'key'].
                at com.sap.engine.services.servlets_jsp.server.application.WebComponents.getServlet(WebComponents.java:841)
                at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:385)
                at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:210)
               ....

• SAP NetWeaver 7.3
• SAP enhancement package 1 for SAP NetWeaver 7.3
• SAP NetWeaver 7.4

500 Internal Server Error, startpage, component [startPage], application [sap.com/com.sap.engine.docs.examples] , KBA , BC-JAS-ADM-ADM , Administration , Bug Filed