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bug: lastfm-ts-api: Unable to parse LastFM API response to JSON #449

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Closed as not planned
bug: lastfm-ts-api: Unable to parse LastFM API response to JSON#449
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bugSomething isn't working
@kruoni

Description

@kruoni
kruoni
opened on Jan 19, 2026

Please check existing knowledge before opening an issue

Describe the Bug

Hello!

Since 0.11.0, lastFM sometimes has an error while scrobbling (probably because of a syntax error in the JS if my eyes aren't deceiving me), however retrying works without an issue and I don't really know what causes it.

What configuration types are you using for multi-scrobbler? Check all that apply.

Platform

Docker

Versions

  • jellyfin: 10.11.5
  • multi-scrobbler: 0.11.0

Logs

[2026-01-19 23:08:52.422 +0100] INFO   : [App] [Scrobblers] [Lastfm - KuoFM] Scrobbled (Backlog) => (Jellyfin) lost machine - myheart.mid @ 2026-01-19T23:01:41+01:00 (S)
[2026-01-19 23:08:52.420 +0100] DEBUG  : [App] [Scrobblers] [API - Lastfm - KuoFM] Raw Payload
    payload: {
      "artist": "lost machine",
      "track": "myheart.mid",
      "album": "FAUX_NOMBRES",
      "timestamp": 1768860101,
      "duration": 303.8480829,
      "albumArtist": "lost machine"
    }
[2026-01-19 23:08:52.232 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] Jellyfin: lost machine - myheart.mid @ 2026-01-19T23:01:41+01:00 (S) => No existing scrobble matched with a score higher than 0
[2026-01-19 23:08:49.377 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] Found 40 recent scrobbles
[2026-01-19 23:08:49.375 +0100] DEBUG  : [App] [Scrobblers] [API - Lastfm - KuoFM] Ignoring 'now playing' track returned from Last.fm client
    track: "myheart.mid"
    mbid: "da24f572-de1b-4e4d-bbeb-ae8a40bb13bb"
[2026-01-19 23:08:48.998 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] Refreshing recent scrobbles
[2026-01-19 23:08:48.998 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] [Upstream Refresh] Should refresh => newest queued scrobble playDate is newer than last refresh
[2026-01-19 23:08:48.990 +0100] INFO   : [App] [Scrobblers] [Lastfm - KuoFM] Scrobble processing started
[2026-01-19 23:08:44.255 +0100] DEBUG  : [App] [Sources] [Jellyfin - KuoFin] Last activity was at 23:08:44+01:00 | Next check in 10.00s | No new tracks discovered
[2026-01-19 23:08:44.249 +0100] DEBUG  : [App] [Sources] [Jellyfin - KuoFin] [Player F1181A69-C-iPhone-Discrete-kuo] 
Reported: STOPPED | Calculated: STOPPED | Stale: No | Orphaned: No | Player Updated At: 23:08:44+01:00 | Play Updated At: N/A
Listened For: 0s 
[2026-01-19 23:08:39.142 +0100] DEBUG  : [App] [Cache] [Auth] Saved cache to file
[2026-01-19 23:08:39.138 +0100] DEBUG  : [App] [Cache] [Scrobble] Saved cache to file
[2026-01-19 23:08:34.226 +0100] DEBUG  : [App] [Sources] [Jellyfin - KuoFin] Last activity was at 23:08:34+01:00 | Next check in 10.00s | No new tracks discovered
[2026-01-19 23:08:34.225 +0100] DEBUG  : [App] [Sources] [Jellyfin - KuoFin] [Player F1181A69-C-iPhone-Discrete-kuo] 
Reported: STOPPED | Calculated: STOPPED | Stale: No | Orphaned: No | Player Updated At: 23:08:34+01:00 | Play Updated At: N/A
Listened For: 0s 
[2026-01-19 23:08:33.989 +0100] INFO   : [App] [Scrobblers] [Lastfm - KuoFM] Scrobble processing retries (2) less than max processing retries (5), restarting processing after 15 second delay...
[2026-01-19 23:08:33.986 +0100] ERROR  : [App] [Scrobblers] [Lastfm - KuoFM] lastfm-ts-api: Unable to parse LastFM API response to JSON. API response is SyntaxError: Unexpected token '<', "<html>
<h"... is not valid JSON
Error: lastfm-ts-api: Unable to parse LastFM API response to JSON. API response is SyntaxError: Unexpected token '<', "<html>
<h"... is not valid JSON
    at <anonymous> (CWD/node_modules/lastfm-ts-api/src/api-request.ts:98:11)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async LastfmApiClient.callApi (CWD/src/backend/common/vendor/LastfmApiClient.ts:96:20)
    at async LastfmApiClient.getRecentTracks (CWD/src/backend/common/vendor/LastfmApiClient.ts:240:20)
    at async LastfmScrobbler.getScrobblesForRefresh (CWD/src/backend/scrobblers/LastfmScrobbler.ts:60:16)
    at async LastfmScrobbler.refreshScrobbles (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:343:28)
    at async LastfmScrobbler.doProcessing (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:769:25)
    at async LastfmScrobbler.startScrobbling (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:702:27)
[2026-01-19 23:08:33.985 +0100] ERROR  : [App] [Scrobblers] [Lastfm - KuoFM] Scrobble processing interrupted
[2026-01-19 23:08:33.935 +0100] DEBUG  : [App] [Scrobblers] [API - Lastfm - KuoFM] 
[2026-01-19 23:08:29.661 +0100] DEBUG  : [App] [Scrobblers] [Tealfm - KuoTeal] Updated queued scrobble cache
[2026-01-19 23:08:29.646 +0100] INFO   : [App] [Scrobblers] [Tealfm - KuoTeal] Scrobbled (Backlog) => (Jellyfin) lost machine - myheart.mid @ 2026-01-19T23:01:41+01:00 (S)
[2026-01-19 23:08:29.138 +0100] DEBUG  : [App] [Cache] [Scrobble] Saved cache to file
[2026-01-19 23:08:29.047 +0100] DEBUG  : [App] [Scrobblers] [Tealfm - KuoTeal] Jellyfin: lost machine - myheart.mid @ 2026-01-19T23:01:41+01:00 (S) => No existing scrobble matched with a score higher than 0
[2026-01-19 23:08:28.914 +0100] WARN   : [App] [Scrobblers] [API - Lastfm - KuoFM] API call was not good but recoverable (operation failed), retrying in 1.5 seconds...
[2026-01-19 23:08:26.052 +0100] DEBUG  : [App] [Scrobblers] [Tealfm - KuoTeal] Found 40 recent scrobbles
[2026-01-19 23:08:25.711 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] Refreshing recent scrobbles
[2026-01-19 23:08:25.711 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] [Upstream Refresh] Should refresh => newest queued scrobble playDate is newer than last refresh
[2026-01-19 23:08:25.706 +0100] DEBUG  : [App] [Scrobblers] [Tealfm - KuoTeal] Refreshing recent scrobbles
[2026-01-19 23:08:25.705 +0100] DEBUG  : [App] [Scrobblers] [Tealfm - KuoTeal] [Upstream Refresh] Should refresh => newest queued scrobble playDate is newer than last refresh
[2026-01-19 23:08:24.339 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] [Now Playing] Now Playing matches and was last updated 89s ago (threshold 304.8480829s), not updating
[2026-01-19 23:08:24.220 +0100] DEBUG  : [App] [Scrobblers] [Tealfm - KuoTeal] Updated queued scrobble cache
[2026-01-19 23:08:24.209 +0100] DEBUG  : [App] [Scrobblers] [Lastfm - KuoFM] Updated queued scrobble cache
[2026-01-19 23:08:24.198 +0100] DEBUG  : [App] [Sources] [Jellyfin - KuoFin] Last activity was at 23:08:24+01:00 | Next check in 10.00s
[2026-01-19 23:08:24.178 +0100] INFO   : [App] [Sources] [Jellyfin - KuoFin] Discovered => lost machine - myheart.mid @ 2026-01-19T23:01:41+01:00 (S)
[2026-01-19 23:08:24.173 +0100] DEBUG  : [App] [Sources] [Jellyfin - KuoFin] [Player F1181A69-C-iPhone-Discrete-kuo] 
Reported: STOPPED | Calculated: STOPPED | Stale: No | Orphaned: No | Player Updated At: 23:08:24+01:00 | Play Updated At: N/A
Listened For: 0s 
[2026-01-19 23:08:24.168 +0100] VERBOSE: [App] [Sources] [Jellyfin - KuoFin] [Player F1181A69-C-iPhone-Discrete-kuo] (1a69ce46e481d67b4c577575e9c650ed) lost machine - myheart.mid added after met thresholds with tracked time of 291.68s (wanted 240s) and tracked percent of 96.00% (wanted 50%) and not matching any prior plays

Additional Context

Dont' have more logs for this one error, sorry.

[2026-01-19 18:15:35.568 +0100] ERROR  : [App] [Scrobblers] [Lastfm - KuoFM] Error occurred while trying to scrobble
Error: Error occurred while trying to scrobble
    at LastfmScrobbler.doProcessing (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:787:39)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async LastfmScrobbler.startScrobbling (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:702:27)
caused by: Error: Error received from Last.fm API
    at LastfmApiClient.scrobble (CWD/src/backend/common/vendor/LastfmApiClient.ts:355:23)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async LastfmScrobbler.doScrobble (CWD/src/backend/scrobblers/LastfmScrobbler.ts:90:28)
    at async LastfmScrobbler.doProcessing (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:777:51)
    at async LastfmScrobbler.startScrobbling (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:702:27)
caused by: Error: lastfm-ts-api: Unable to parse LastFM API response to JSON. API response is SyntaxError: Unexpected token '<', "
<html><hea"... is not valid JSON
    at <anonymous> (CWD/node_modules/lastfm-ts-api/src/api-request.ts:98:11)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async LastfmApiClient.callApi (CWD/src/backend/common/vendor/LastfmApiClient.ts:96:20)
    at async LastfmApiClient.scrobble (CWD/src/backend/common/vendor/LastfmApiClient.ts:309:30)
    at async LastfmScrobbler.doScrobble (CWD/src/backend/scrobblers/LastfmScrobbler.ts:90:28)
    at async LastfmScrobbler.doProcessing (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:777:51)
    at async LastfmScrobbler.startScrobbling (CWD/src/backend/scrobblers/AbstractScrobbleClient.ts:702:27)
[2026-01-19 18:15:35.564 +0100] ERROR  : [App] [Scrobblers] [Lastfm - KuoFM] Scrobble processing interrupted
[2026-01-19 18:15:35.558 +0100] ERROR  : [App] [Scrobblers] [Lastfm - KuoFM] Scrobble Error (Backlog)
    playInfo: "Toby Fox - A DARK ZONE @ 2026-01-19T18:13:09+01:00 (S)"
    payload: {
      "artist": "Toby Fox",
      "track": "A DARK ZONE",
      "album": "DELTARUNE Chapters 3+4 OST",
      "timestamp": 1768842789,
      "duration": 138,
      "albumArtist": "Toby Fox"
    }

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