Event 1309 ASP.NET

Hello,

We have a Windows Server 2016 box that is being used for users to remote in to their computers by way of RDWeb. Every time someone goes to the website to login we we get the following Warning logged in events:

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 10/26/2018 10:49:47 AM 
Event time (UTC): 10/26/2018 2:49:47 PM 
Event ID: 00f90daa62f94580925cf71413f5874d 
Event sequence: 5 
Event occurrence: 1 
Event detail code: 0 
Application information: 
    Application domain: /LM/W3SVC/1/ROOT/RDWeb/Pages-6-131850389869549350 
    Trust level: Full 
    Application Virtual Path: /RDWeb/Pages 
    Application Path: C:\WINDOWS\Web\RDWeb\Pages\ 
    Machine name: XXXXXX 
Process information: 
    Process ID: 5096 
    Process name: w3wp.exe 
    Account name: IIS APPPOOL\RDWebAccess 
Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object.
   at Microsoft.TerminalServices.Publishing.Portal.FormAuthentication.TSFormAuthTicketInfo..ctor(HttpContext objHttpContext)
   at ASP.en_us_default_aspx.<GetAppsAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Web.UI.PageAsyncTaskManager.<ExecuteTasksAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.UI.Page.<ProcessRequestAsync>d__554.MoveNext()

 
 
Request information: 
    Request URL: https://XXXXXXXXX:443/RDWeb/Pages/en-US/Default.aspx 
    Request path: /RDWeb/Pages/en-US/Default.aspx 
    User host address: XXXXXXXX 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: IIS APPPOOL\RDWebAccess 
 
Thread information: 
    Thread ID: 115 
    Thread account name: IIS APPPOOL\RDWebAccess 
    Is impersonating: False 
    Stack trace:    at Microsoft.TerminalServices.Publishing.Portal.FormAuthentication.TSFormAuthTicketInfo..ctor(HttpContext objHttpContext)
   at ASP.en_us_default_aspx.<GetAppsAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Web.UI.PageAsyncTaskManager.<ExecuteTasksAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.UI.Page.<ProcessRequestAsync>d__554.MoveNext()
Custom event details: