jellyfin/jellyfin · error · ResourceNotFoundException

User with UserId not found

Error message

User with UserId {authInfo.UserId} not found

What it means

DeviceManager.ToDeviceInfo throws ResourceNotFoundException('User with UserId ... not found') when the Device record's UserId no longer resolves to a user via GetUserById. ToDeviceInfo builds a DeviceInfo including the LastUserName, so it must look up the user; a deleted user makes the lookup return null and the coalescing throw fires.

Solutions

1. Clean up orphaned device rows whose UserId no longer exists, then retry the device listing.
2. Re-add or re-map the referenced user, or delete the stale device entries via the admin UI/API before listing.
3. If maintaining a custom DeviceManager, guard ToDeviceInfo to skip/filter devices whose user is missing.

Example fix

// before
var user = _userManager.GetUserById(authInfo.UserId)
    ?? throw new ResourceNotFoundException(...);
// after
var user = _userManager.GetUserById(authInfo.UserId);
if (user is null) return null; // filter orphaned devices upstream

// Before listing devices, prune orphans
var users = (await client.GetUsersAsync()).Select(u => u.Id).ToHashSet();
var devices = (await client.GetDevicesAsync()).Where(d => users.Contains(d.UserId));

bool UserExists(Guid id, HashSet<Guid> known) => known.Contains(id);

try { devices = await client.GetDevicesAsync(); }
catch (ResourceNotFoundException e) when (e.Message.Contains("User with UserId"))
{ await CleanupOrphanedDevices(); devices = await client.GetDevicesAsync(); }

When it happens

Trigger: Listing or fetching devices (GET /Devices) where one or more Device entries reference a UserId that was deleted. ToDeviceInfo is called while projecting each device, so a single stale device aborts the listing.

Common situations: Users deleted after their devices were registered; database restores that drop users but keep device rows; multi-server device imports carrying foreign user ids.

Related errors

• Couldn't find provider of type
• Failed to find CollectionFolder
• No channel provider found for channel
• No user exists after initialization.
• Password hash with id

AI-assisted analysis of jellyfin/jellyfin@ae8723026d (2026-08-13). Data as JSON: /api/errors/ecf2f97cc895e9ad. Report an issue: GitHub.

Appendix: source

Thrown at Jellyfin.Server.Implementations/Devices/DeviceManager.cs:254

        /// <inheritdoc />
        public bool CanAccessDevice(User user, string deviceId)
        {
            ArgumentNullException.ThrowIfNull(user);
            ArgumentException.ThrowIfNullOrEmpty(deviceId);

            if (user.HasPermission(PermissionKind.EnableAllDevices) || user.HasPermission(PermissionKind.IsAdministrator))
            {
                return true;
            }

            return user.GetPreference(PreferenceKind.EnabledDevices).Contains(deviceId, StringComparison.OrdinalIgnoreCase)
                   || !GetCapabilities(deviceId).SupportsPersistentIdentifier;
        }

        private DeviceInfo ToDeviceInfo(Device authInfo, DeviceOptions? options = null)
        {
            var caps = GetCapabilities(authInfo.DeviceId);
            var user = _userManager.GetUserById(authInfo.UserId) ?? throw new ResourceNotFoundException("User with UserId " + authInfo.UserId + " not found");

            return new()
            {
                AppName = authInfo.AppName,
                AppVersion = authInfo.AppVersion,
                Id = authInfo.DeviceId,
                LastUserId = authInfo.UserId,
                LastUserName = user.Username,
                Name = authInfo.DeviceName,
                DateLastActivity = authInfo.DateLastActivity,
                IconUrl = caps.IconUrl,
                CustomName = options?.CustomName,
            };
        }

        private DeviceOptionsDto ToDeviceOptionsDto(DeviceOptions options)
        {
            return new()

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