"Http/1.1 Internal Server Error 43531" when accessing Citrix Gateway after upgrading to version 13.0

Users will get the error "Http/1.1 Internal Server Error 43531" The ns.log will give error as below: Dec 23 14:52:26 , aaainfo flags 11 flags2 0, new webview 0, sess flags2 0, flags3 0 flags4 400 ssoDomain , ssoUsername: , ssoUsername2: " Dec 23 14:52:26 XXX.XXX.X.XXX 12/23/2020:19:52:26 GMT...