Lock-up during sync if accessing music library

[oddstr13]

Describe the bug

Accessing Music library during initial sync of the music library causes Kodi and the addon to lock up, requiring killing of the process.

To Reproduce

1. Reset database
2. Start syncing Music library
3. Attempt to open Music library while the sync is still running
4. Observe that the syncing stalled, and that the Music library does not load

System (please complete the following information):

• OS: Mint
• Jellyfin Version: 10.9.2
• Kodi Version: 20.2
• Addon Version: master
• Playback Mode: Add-On

Additional context I've encountered this before, but it seems I haven't documented it with an issue (or I failed to find it now).

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lockup lock-up freeze crash music library scan accessing loading opening