I'm running into an issue after installing a CU in my sharepoint 2013 farm. Installed the CU restarted my AP server, stopped services: spadminv4, sptimerv4, sptracev4 spwriterv4 and w3svc. Ran the PSCONFIG.exe command: PSCONFIG.EXE -cmd upgrade -inplace b2b -wait -force -cmd applicationcontent -install -cmd installfeatures -cmd installcheck -noinstallcheck and the upgrade fails.

here's the error message in the logs:

Failed to upgrade SharePoint Products. An exception of type System.NullReferenceException was thrown. Additional exception information: Object reference not set to an instance of an object. System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.SharePoint.Upgrade.SPContentDatabaseIntegrity.CheckAppOrphans() at Microsoft.SharePoint.Upgrade.SPContentDatabaseIntegrity.Check(SPContentDatabaseIntegrityCheckOptions options) at Microsoft.SharePoint.Upgrade.SPContentDatabaseSequence.ContentDatabaseDataIntegrityCheck() at Microsoft.SharePoint.Upgrade.SPContentDatabaseSequence.PreUpgrade() at Microsoft.SharePoint.Upgrade.SPUpgradeSession.Upgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.Upgrade(Boolean recursively) at Microsoft.SharePoint.Administration.SPDatabase.Upgrade(Boolean recursively) at Microsoft.SharePoint.Administration.SPContentDatabase.<>c__DisplayClass2.b__0() at Microsoft.SharePoint.SPSecurity.RunAsUser(SPUserToken userToken, Boolean bResetContext, WaitCallback code, Object param) at Microsoft.SharePoint.Administration.SPContentDatabase.Upgrade(Boolean recursively) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.ReflexiveUpgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.Upgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.Upgrade(Boolean recursively) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.ReflexiveUpgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.Upgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.Upgrade(Boolean recursively) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.ReflexiveUpgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.Upgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.Upgrade(Boolean recursively) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.ReflexiveUpgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.Upgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.Upgrade(Boolean recursively) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.ReflexiveUpgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.Upgrade.SPUpgradeSession.Upgrade(Object o, Boolean bRecurse) at Microsoft.SharePoint.PostSetupConfiguration.UpgradeTask.Run() at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()

Any ideas as to why it's failing?