Error Errore 500

Object reference not set to an instance of an object.

at Inlinea.VenditePrivate.Web.Controllers.SearchController.tiporicercaAG(String tipoATP, String categoria) in C:\agent\_work\94\s\Inlinea.VenditePrivate.Web\Controllers\SearchController.cs:line 480 at Inlinea.VenditePrivate.Web.Controllers.SearchController.MappaRicercaATPsuAG(SearchParameters criteria) in C:\agent\_work\94\s\Inlinea.VenditePrivate.Web\Controllers\SearchController.cs:line 505 at Inlinea.VenditePrivate.Web.Controllers.SearchController.<CheckVenditeAG>d__4.MoveNext() in C:\agent\_work\94\s\Inlinea.VenditePrivate.Web\Controllers\SearchController.cs:line 376 --- 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 Inlinea.VenditePrivate.Web.Controllers.SearchController.<DetailSeo>d__1.MoveNext() in C:\agent\_work\94\s\Inlinea.VenditePrivate.Web\Controllers\SearchController.cs:line 240 --- 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.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass8_0.<BeginInvokeAsynchronousActionMethod>b__1(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_0.<InvokeActionMethodFilterAsynchronouslyRecursive>b__0() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_5.<BeginInvokeAction>b__4() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_0.<BeginInvokeAction>b__1(IAsyncResult asyncResult)