title: PingFederate SLO: NullPointerException org.sourceid.saml20.util.NameIdHashKey.equals
body: <p>I am using PingFederate 7 as SP and mod_pf apache module integration kit. 
  I have configured PingFederateSLOURL for making SLO logout call:</p>
  
  <p><code>PingFederateSLOURL https://&lt;pingfederateurl&gt;/?PartnerIdpId=&lt;PartnerIdp URL&gt;</code></p>
  
  <p>I am getting below error while making the /sp/startSLO.ping</p>
  
  <p>`
  java.lang.NullPointerException
          at org.sourceid.saml20.util.NameIdHashKey.equals(NameIdHashKey.java:67)
          at org.sourceid.websso.profiles.sp.SloSupport.getByAdapterIdAndFirstCorrespondingPartnerIdPlus(SloSupport.java:131)
          at org.sourceid.websso.profiles.sp.SloSupport.chooseAuthnBeansAndSessions(SloSupport.java:77)
          at org.sourceid.websso.profiles.sp.CreateSloRequest.doProcess(CreateSloRequest.java:71)
          at org.sourceid.websso.profiles.RequestCreatorBase.process(RequestCreatorBase.java:50)
          at org.sourceid.saml20.profiles.ProfileProcessManager.doCreateRequest(ProfileProcessManager.java:59)
          at $ProfileProcessMgmtService_15724fe023a.doCreateRequest($ProfileProcessMgmtService_15724fe023a.java)</p>
  
  <p>`
  I have configured SP adapter using OpentTokenAdapter.</p>