Everytime we try and delete something from the Backoffice, uSync throws an NullReferenceException at us, and I have no idea what is causing this. Is anyone experiencing the same behaviour?

Exception
System.NullReferenceException: Object reference not set to an instance of an object.
   vid uSync8.ContentEdition.Serializers.ContentSerializer.FindItem(Int32 id)
   vid uSync8.ContentEdition.Serializers.ContentSerializerBase`1.SerializeInfo(TObject item)
   vid uSync8.ContentEdition.Serializers.ContentSerializer.SerializeInfo(IContent item)
   vid uSync8.ContentEdition.Serializers.ContentSerializer.SerializeCore(IContent item)
   vid uSync8.Core.Serialization.SyncSerializerBase`1.Serialize(TObject item)
   vid uSync8.BackOffice.SyncHandlers.SyncHandlerBase`2.Export(TObject item, String folder, HandlerSettings config)
   vid uSync8.BackOffice.SyncHandlers.SyncHandlerBase`2.EventMovedItem(IService sender, MoveEventArgs`1 e)
   vid Umbraco.Core.Events.TypedEventHandler`2.Invoke(TSender sender, TEventArgs e)
   vid Umbraco.Core.Events.EventDefinition`2.RaiseEvent() i D:\a\1\s\src\Umbraco.Core\Events\EventDefinition.cs:rad 69
   vid Umbraco.Core.Events.QueuingEventDispatcher.ScopeExitCompleted() i D:\a\1\s\src\Umbraco.Core\Events\QueuingEventDispatcher.cs:rad 23
   vid Umbraco.Core.Events.QueuingEventDispatcherBase.ScopeExit(Boolean completed) i D:\a\1\s\src\Umbraco.Core\Events\QueuingEventDispatcherBase.cs:rad 337
   vid Umbraco.Core.Scoping.Scope.<>c__DisplayClass71_0.<RobustExit>b__1() i D:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:rad 434
   vid Umbraco.Core.Scoping.Scope.TryFinally(Int32 index, Action[] actions) i D:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:rad 472
   vid Umbraco.Core.Scoping.Scope.TryFinally(Int32 index, Action[] actions) i D:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:rad 476
   vid Umbraco.Core.Scoping.Scope.RobustExit(Boolean completed, Boolean onException) i D:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:rad 420
   vid Umbraco.Core.Scoping.Scope.DisposeLastScope() i D:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:rad 400
   vid Umbraco.Core.Scoping.Scope.Dispose() i D:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:rad 363
   vid Umbraco.Core.Services.Implement.ContentService.MoveToRecycleBin(IContent content, Int32 userId) i D:\a\1\s\src\Umbraco.Core\Services\Implement\ContentService.cs:rad 1903
   vid Umbraco.Web.Editors.ContentController.DeleteById(Int32 id)
   vid lambda_method(Closure , Object , Object[] )
   vid System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_2.<GetExecutor>b__2(Object instance, Object[] methodParameters)
   vid System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
   vid System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
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