jellyfin/jellyfin · error · ResourceNotFoundException

User with UserId {authInfo.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.

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()

View on GitHub (pinned to ae8723026d)

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

• Password hash with id '{hash.Id}' is missing required 'itera
• Password hash with id '{hash.Id}' has invalid 'iterations' p
• User account has been disabled.
• User not found
• No user exists after initialization.

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