Describe the bug
Metadata search stopped working - "Search error!!". The only change, barring package upgrade on the RPi OS, was the addition of a Hardcover API token to the Docker Compose file.

To Reproduce
Steps to reproduce the behavior:

1. Go to any book and open the details view
2. Click "Fetch Metadata" and watch the search panel come up
3. (optionally) Type another book title string and click "Search" again

Expected behavior
Search results based on the title given should show up, as they did previously.

Configuration(please complete the following information):

• OS: Raspberry Pi OS, Docker image
• Hardware: RPi 3b+