Error on http://localhost:3000/album/NN

If I click on the album cover - everything is ok, and I can see album page, play tracks and so on. But If I try to open directly the same URL in browser, for example http://localhost:3000/album/20 I got an error: "500: Internal Error" and those messages in the log:

fetch failed
TypeError: fetch failed
    at fetch (/home/beets/beetle/node_modules/undici/index.js:105:13)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async fetch (file:///home/beets/beetle/node_modules/@sveltejs/kit/src/runtime/server/fetch.js:57:21)
    at async Object.fetch (file:///home/beets/beetle/node_modules/@sveltejs/kit/src/runtime/server/fetch.js:19:10)
    at async fetch (file:///home/beets/beetle/node_modules/@sveltejs/kit/src/runtime/server/page/load_data.js:104:21)
    at async load (/src/routes/album/[slug]/+page.js:5:15)
    at async load_data (file:///home/beets/beetle/node_modules/@sveltejs/kit/src/runtime/server/page/load_data.js:215:15)
    at async file:///home/beets/beetle/node_modules/@sveltejs/kit/src/runtime/server/page/index.js:170:13