[Issue]: DB Null exception during library scan starting with 10.9.4

[ddevler]

Please describe your bug

works fine in 10.9.3. Error occurs from 10.9.4 - 10.9.6.
Not sure the db entry causing the issue. Scan media library fails every time it's run. I had to rollback to 10.9.3.

Reproduction Steps

Run scan media library.

Jellyfin Version

10.9.0

if other:

10.9.4

Environment

- OS: docker
- Linux Kernel:
- Virtualization: docker
- Clients:
- Browser:
- FFmpeg Version:
- Playback Method:
- Hardware Acceleration:
- GPU Model:
- Plugins:
- Reverse Proxy:
- Base URL:
- Networking:
- Storage:

Jellyfin logs

[12:26:05] [INF] [39] Trakt.Helpers.LibraryManagerEventsHelper: Timer elapsed - processing queued items
[12:26:05] [INF] [39] Trakt.Helpers.LibraryManagerEventsHelper: No events... stopping queue timer
[12:31:06] [ERR] [75] Emby.Server.Implementations.ScheduledTasks.TaskManager: Error executing Scheduled Task
System.InvalidOperationException: The data is NULL at ordinal 1. This method can't be called on NULL values. Check using IsDBNull before calling.
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetNull[T](Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteValueReader.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetCachedBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetStream(Int32 ordinal)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItem(SqliteDataReader reader, InternalItemsQuery query, Boolean enableProgramAttributes, Boolean hasEpisodeAttributes, Boolean hasServiceName, Boolean queryHasStartDate, Boolean hasTrailerTypes, Boolean hasArtistFields, Boolean hasSeriesFields, Boolean skipDeserialization)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItemList(InternalItemsQuery query)
   at MediaBrowser.Controller.Entities.Folder.GetActualChildrenDictionary()
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.AggregateFolder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at Emby.Server.Implementations.Library.LibraryManager.PerformLibraryValidation(IProgress`1 progress, CancellationToken cancellationToken)
   at Emby.Server.Implementations.Library.LibraryManager.ValidateMediaLibraryInternal(IProgress`1 progress, CancellationToken cancellationToken)
   at Emby.Server.Implementations.ScheduledTasks.ScheduledTaskWorker.ExecuteInternal(TaskOptions options)
[12:31:06] [INF] [75] Emby.Server.Implementations.ScheduledTasks.TaskManager: Scan Media Library Failed after 5 minute(s) and 50 seconds

FFmpeg logs

No response

Please attach any browser or client logs here

No response

Please attach any screenshots here

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[jellyfin-bot]

Hi, it seems like your issue report has the following item(s) that need to be addressed:

• You have not filled in the environment completely.

This is an automated message, currently under testing. Please file an issue here if you encounter any problems.

[Shadowghost]

How did you roll back?
My guess is that the audio backfill migration in 10.9.4 did not complete or you missed re-enabling it when restoring your backup.
Stop Jellyfin, remove the entry below from your migrations.xml in the config folder and restart Jellyfin. Wait until the migration completes;

    <ValueTupleOfGuidString>
      <Item1>cf6fabc2-9fbe-4933-84a5-ffe52ef22a58</Item1>
      <Item2>FixAudioData</Item2>
    </ValueTupleOfGuidString>

[ddevler]

same issue scan failed. Also it this similar exception on loading latest now due to NULL.
I don't get these exceptions if I run 10.9.3. I think might been something with lyric manager. It was processing for over a day. I'm not sure if it ever finished properly.

[14:29:55] [ERR] [18] Jellyfin.Api.Middleware.ExceptionMiddleware: Error processing request. URL GET /Users/183b156fa5dc446b86bf17df667a/Items/Latest.
System.InvalidOperationException: The data is NULL at ordinal 1. This method can't be called on NULL values. Check using IsDBNull before calling.
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetNull[T](Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteValueReader.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetCachedBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetStream(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataReader.GetStream(Int32 ordinal)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItem(SqliteDataReader reader, InternalItemsQuery query, Boolean enableProgramAttributes, Boolean hasEpisodeAttributes, Boolean hasServiceName, Boolean queryHasStartDate, Boolean hasTrailerTypes, Boolean hasArtistFields, Boolean hasSeriesFields, Boolean skipDeserialization)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItemList(InternalItemsQuery query)
   at Emby.Server.Implementations.Library.LibraryManager.GetItemList(InternalItemsQuery query, List`1 parents)
   at Emby.Server.Implementations.Library.UserViewManager.GetItemsForLatestItems(User user, LatestItemsQuery request, DtoOptions options)
   at Emby.Server.Implementations.Library.UserViewManager.GetLatestItems(LatestItemsQuery request, DtoOptions options)
   at Jellyfin.Api.Controllers.UserLibraryController.GetLatestMedia(Nullable`1 userId, Nullable`1 parentId, ItemFields[] fields, BaseItemKind[] includeItemTypes, Nullable`1 isPlayed, Nullable`1 enableImages, Nullable`1 imageTypeLimit, ImageType[] enableImageTypes, Nullable`1 enableUserData, Int32 limit, Boolean groupItems)
   at lambda_method1170(Closure, Object, Object[])
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Jellyfin.Api.Middleware.ServerStartupMessageMiddleware.Invoke(HttpContext httpContext, IServerApplicationHost serverApplicationHost, ILocalizationManager localizationManager)
   at Jellyfin.Api.Middleware.WebSocketHandlerMiddleware.Invoke(HttpContext httpContext, IWebSocketManager webSocketManager)
   at Jellyfin.Api.Middleware.IPBasedAccessValidationMiddleware.Invoke(HttpContext httpContext, INetworkManager networkManager)
   at Jellyfin.Api.Middleware.LanFilteringMiddleware.Invoke(HttpContext httpContext, INetworkManager networkManager, IServerConfigurationManager serverConfigurationManager)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Jellyfin.Api.Middleware.QueryStringDecodingMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.ReDoc.ReDocMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Jellyfin.Api.Middleware.RobotsRedirectionMiddleware.Invoke(HttpContext httpContext)
   at Jellyfin.Api.Middleware.LegacyEmbyRouteRewriteMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.InvokeCore(HttpContext context)
   at Jellyfin.Api.Middleware.ResponseTimeMiddleware.Invoke(HttpContext context, IServerConfigurationManager serverConfigurationManager)
   at Jellyfin.Api.Middleware.ExceptionMiddleware.Invoke(HttpContext context)
[14:30:05] [INF] [31] Emby.Server.Implementations.Library.LibraryManager: Validating media library

[Shadowghost]

As I said, you need to re-run the migration on 10.9.6 to fix the issue.

[ddevler]

I tried that after you mentioned it. No change.
It said skipped migrations due to a fresh install, but it's not.
I removed the docker image and pull it again just incase.

jellyfin  | [15:15:24] [INF] [1] Jellyfin.Server.Migrations.MigrationRunner: Marking following migrations as applied because this is a fresh install: ["DisableTranscodingThrottling", "CreateLoggingConfigHeirarchy", "MigrateActivityLogDatabase", "RemoveDuplicateExtras", "MigrateUserDatabase", "MigrateDisplayPreferencesDatabase", "RemoveDownloadImagesInAdvance", "MigrateAuthenticationDatabase", "FixPlaylistOwner", "MigrateRatingLevels", "FixAudioData"]

Full scan still errors out with same error from initial post.

[gnattu]

Your install is really in a super in-consistent state because it appears that your config folder does not actually reflects the correct state of your installation.

[ddevler]

not sure what happened during the upgrades to break the state. I just started over with clean install and resynced play states from Trakt. Everything scanned and worked correctly starting with fresh install of 10.9.6.

[Kevinjil]

I have similar problems. Have not downgraded, only incremental upgrades:

[22:11:48] [ERR] [11] Jellyfin.Api.Middleware.ExceptionMiddleware: Error processing request. URL GET /Users/3ed2c035a65445da925c5ef17c3a4be1/Items/Latest.
System.InvalidOperationException: The data is NULL at ordinal 1. This method can't be called on NULL values. Check using IsDBNull before calling.
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetNull[T](Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteValueReader.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetCachedBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetStream(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataReader.GetStream(Int32 ordinal)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItem(SqliteDataReader reader, InternalItemsQuery query, Boolean enableProgramAttributes, Boolean hasEpisodeAttributes, Boolean hasServiceName, Boolean queryHasStartDate, Boolean hasTrailerTypes, Boolean hasArtistFields, Boolean hasSeriesFields, Boolean skipDeserialization)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItemList(InternalItemsQuery query)
   at Emby.Server.Implementations.Library.LibraryManager.GetItemList(InternalItemsQuery query, List`1 parents)
   at Emby.Server.Implementations.Library.UserViewManager.GetItemsForLatestItems(User user, LatestItemsQuery request, DtoOptions options)
   at Emby.Server.Implementations.Library.UserViewManager.GetLatestItems(LatestItemsQuery request, DtoOptions options)
   at Jellyfin.Api.Controllers.UserLibraryController.GetLatestMedia(Nullable`1 userId, Nullable`1 parentId, ItemFields[] fields, BaseItemKind[] includeItemTypes, Nullable`1 isPlayed, Nullable`1 enableImages, Nullable`1 imageTypeLimit, ImageType[] enableImageTypes, Nullable`1 enableUserData, Int32 limit, Boolean groupItems)
   at lambda_method1252(Closure, Object, Object[])
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Jellyfin.Api.Middleware.ServerStartupMessageMiddleware.Invoke(HttpContext httpContext, IServerApplicationHost serverApplicationHost, ILocalizationManager localizationManager)
   at Jellyfin.Api.Middleware.WebSocketHandlerMiddleware.Invoke(HttpContext httpContext, IWebSocketManager webSocketManager)
   at Jellyfin.Api.Middleware.IPBasedAccessValidationMiddleware.Invoke(HttpContext httpContext, INetworkManager networkManager)
   at Jellyfin.Api.Middleware.LanFilteringMiddleware.Invoke(HttpContext httpContext, INetworkManager networkManager, IServerConfigurationManager serverConfigurationManager)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Jellyfin.Api.Middleware.QueryStringDecodingMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.ReDoc.ReDocMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Jellyfin.Api.Middleware.RobotsRedirectionMiddleware.Invoke(HttpContext httpContext)
   at Jellyfin.Api.Middleware.LegacyEmbyRouteRewriteMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.InvokeCore(HttpContext context)
   at Jellyfin.Api.Middleware.ResponseTimeMiddleware.Invoke(HttpContext context, IServerConfigurationManager serverConfigurationManager)
   at Jellyfin.Api.Middleware.ExceptionMiddleware.Invoke(HttpContext context)

[22:11:56] [ERR] [13] Emby.Server.Implementations.ScheduledTasks.TaskManager: Error executing Scheduled Task
System.InvalidOperationException: The data is NULL at ordinal 1. This method can't be called on NULL values. Check using IsDBNull before calling.
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetNull[T](Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteValueReader.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetCachedBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataRecord.GetStream(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataReader.GetStream(Int32 ordinal)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItem(SqliteDataReader reader, InternalItemsQuery query, Boolean enableProgramAttributes, Boolean hasEpisodeAttributes, Boolean hasServiceName, Boolean queryHasStartDate, Boolean hasTrailerTypes, Boolean hasArtistFields, Boolean hasSeriesFields, Boolean skipDeserialization)
   at Emby.Server.Implementations.Data.SqliteItemRepository.GetItemList(InternalItemsQuery query)
   at MediaBrowser.Controller.Entities.Folder.GetCachedChildren()
   at MediaBrowser.Controller.Entities.Folder.LoadChildren()
   at MediaBrowser.Controller.Entities.Folder.get_Children()
   at MediaBrowser.Controller.Entities.Folder.GetActualChildrenDictionary()
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.<>c__DisplayClass69_0`1.<<RunTasks>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at MediaBrowser.Controller.Entities.Folder.RunTasks[T](Func`3 task, IList`1 children, IProgress`1 progress, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal2(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at MediaBrowser.Controller.Entities.AggregateFolder.ValidateChildrenInternal(IProgress`1 progress, Boolean recursive, Boolean refreshChildMetadata, Boolean allowRemoveRoot, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService, CancellationToken cancellationToken)
   at Emby.Server.Implementations.Library.LibraryManager.PerformLibraryValidation(IProgress`1 progress, CancellationToken cancellationToken)
   at Emby.Server.Implementations.Library.LibraryManager.ValidateMediaLibraryInternal(IProgress`1 progress, CancellationToken cancellationToken)
   at Emby.Server.Implementations.ScheduledTasks.ScheduledTaskWorker.ExecuteInternal(TaskOptions options)
[22:11:56] [INF] [13] Emby.Server.Implementations.ScheduledTasks.TaskManager: Scan Media Library Failed after 0 minute(s) and 0 seconds

[Cyrus-Harding]

How did you roll back? My guess is that the audio backfill migration in 10.9.4 did not complete or you missed re-enabling it when restoring your backup. Stop Jellyfin, remove the entry below from your migrations.xml in the config folder and restart Jellyfin. Wait until the migration completes;

    <ValueTupleOfGuidString>
      <Item1>cf6fabc2-9fbe-4933-84a5-ffe52ef22a58</Item1>
      <Item2>FixAudioData</Item2>
    </ValueTupleOfGuidString>

Is there anything more to this? I removed the lines containing this in migrations.xml but jellyfin still gives of errors scanning, and gets stuck at 0.0%.