[BUG] Can't add subscriptions. It just loads forever and never adds the channel.

[Paraxes]

Describe the bug
Whenever I try to add a subscription, instead of adding it, it simply is stuck and "loads" forever without ever adding the channel. I also already did a complete fresh install and it didn't help.

Expected behavior
The normal behavior is, that it adds the channel, searches for the videos with the given parameters and downloads them.

Environment
Installation type: docker
Docker tag: nightly
Commit hash: 58f4313
Build date: 2024-04-23

Error Code from my Synology NAS (DS 918+) Docker log

2024-04-25 18:26:33 | stderr | TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received null
2024-04-25 18:26:33 | stderr | at new NodeError (node:internal/errors:371:5)
2024-04-25 18:26:33 | stderr | at validateString (node:internal/validators:120:11)
2024-04-25 18:26:33 | stderr | at Object.join (node:path:1172:7)
2024-04-25 18:26:33 | stderr | at getAppendedBasePath (/app/subscriptions.js:597:17)
2024-04-25 18:26:33 | stderr | at Object.exports.writeSubscriptionMetadata (/app/subscriptions.js:540:30)
2024-04-25 18:26:33 | stderr | at /app/subscriptions.js:39:17
2024-04-25 18:26:33 | stderr | at processTicksAndRejections (node:internal/process/task_queues:96:5) {
2024-04-25 18:26:33 | stderr | code: 'ERR_INVALID_ARG_TYPE'
2024-04-25 18:26:33 | stderr | }