Exception on HttpRequestEntityChangeSetReasonProvider #5129

Any idea about the following error? I trigger an event inside my controller on MyCompany.Web.Core. I have an external module that handle the specific event and at the end publish a notification.

System.NullReferenceException HResult=0x80004003 Message=Object reference not set to an instance of an object. Source=Microsoft.AspNetCore.Http.Extensions StackTrace: at Microsoft.AspNetCore.Http.Extensions.UriHelper.GetDisplayUrl(HttpRequest request) at Abp.AspNetCore.EntityHistory.HttpRequestEntityChangeSetReasonProvider.get_Reason() at Abp.EntityHistory.EntityHistoryHelper.CreateEntityChangeSet(ICollection1 entityEntries) at Abp.Zero.EntityFrameworkCore.AbpZeroCommonDbContext3.<SaveChangesAsync>d__98.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.<SaveChangesInDbContextAsync>d__20.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.<SaveChangesAsync>d__12.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Abp.Notifications.NotificationStore.<InsertNotificationAsync>d__8.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Abp.Threading.InternalAsyncHelper.<AwaitTaskWithPostActionAndFinally>d__1.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) at Abp.Notifications.NotificationPublisher.<PublishAsync>d__12.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Abp.Threading.InternalAsyncHelper.<AwaitTaskWithPostActionAndFinally>d__1.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at Voiago.Core.Business.Notifications.VoiagoNotifier.<ReservationChangedAsync>d__2.MoveNext() in S:\Progetti\SLT\Voiago\Dev\branch-startup\aspnet-core\src\Voiago.Core.Business\Notifications\VoiagoNotifier.cs:line 23 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at Voiago.Core.Business.EventSync.Handlers.EventSyncHandler.<HandleEvent>d__11.MoveNext() in S:\Progetti\SLT\Voiago\Dev\branch-startup\aspnet-core\src\Voiago.Core.Business\EventSync\Handlers\EventSyncHandler.cs:line 70