Umbraco 8 refresh nucache broken after using media service

Umbraco v8.5.3

I have a site where i had to manually import products from csv using content service. After that i had to import media from a pictures folder using media service. There is something wrong because i cant get some pictures using umbraco helper and querying by id (ie. Umbraco.Media(1310)), it gets null. But i can using the content service and then if i save it i can see the picture. Or editing the item using backoffice.

I have tried to rebuild the memory cache (from published status in settings section) but i get this error: System.NullReferenceException: Object reference not set to an instance of an object. First lines of stack trace:

at Umbraco.Web.PublishedCache.NuCache.ContentStore.AddTreeNodeLocked(ContentNode content, LinkedNode`1 parentLink)
   at Umbraco.Web.PublishedCache.NuCache.ContentStore.SetAll(IEnumerable`1 kits)
   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.LoadMediaFromDatabaseLocked(IScope scope, Boolean onStartup)
   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.NotifyLocked(IEnumerable`1 payloads, Boolean& anythingChanged)
   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.Notify(JsonPayload[] payloads, Boolean& anythingChanged)
   at Umbraco.Web.Cache.MediaCacheRefresher.Refresh(JsonPayload[] payloads)
   at Umbraco.Core.Sync.ServerMessengerBase.DeliverLocal[TPayload](ICacheRefresher refresher, TPayload[] payload)
   at Umbraco.Core.Sync.ServerMessengerBase.Deliver[TPayload](ICacheRefresher refresher, TPayload[] payload)
   at Umbraco.Core.Sync.ServerMessengerBase.PerformRefresh[TPayload](ICacheRefresher refresher, TPayload[] payload)
   at Umbraco.Web.Cache.DistributedCache.RefreshByPayload[TPayload](Guid refresherGuid, TPayload[] payload)
   at Umbraco.Web.Cache.DistributedCacheExtensions.RefreshAllMediaCache(DistributedCache dc)
   at Umbraco.Web.Cache.DistributedCacheExtensions.RefreshAllPublishedSnapshot(DistributedCache dc)
   at lambda_method(Closure , Object , Object[] )
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_1.<GetExecutor>b__0(Object instance, Object[] methodParameters)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

I have tried to rebuild the database cache, it gets no error but the problem persists and after that if i try to rebuild the memory cache i get same error.

Also, i have tried to query all media items in db and use the media service to save again using this code:

var ms = Current.Services.MediaService;

List<int> mediaItems;

        using (var scope = Current.ScopeProvider.CreateScope())
        {

            mediaItems = scope.Database.Query<int>("SELECT id FROM umbracoNode where nodeObjectType='B796F64C-1F99-4FFB-B886-4BF4BC011A9C'").ToList();

        }
var mediaProblems= mediaItems.Where(it => Umbraco.Media(it) == null).ToList();

foreach (var itemId in mediaProblems)
           {

                var obj = ms.GetById(itemId);

                ms.Save(obj);

            }

After that i clean temp files from app_data and restart the app and all the pictures go back. Then if i try to reload cache problem goes back again.

I guess at some point there was an error in the database, but how could i fix this?

[nul800sebastiaan]

@andersbrohall 9 minutes after you asked… because you asked, of course! 😂 https://twitter.com/umbraco/status/1244921666679046144

Some world pandemic got in the way of our plans, sorry about the delay. 😉

[teeto]

@andersbrohall if you have the same problem it is not solved on 8.6 You better follow the issue here: https://github.com/umbraco/Umbraco-CMS/issues/7868