Generated book pages are empty

[HelgeStenstrom]

I'm fairly new to Obsidian, and have only used the Book Search plugin for about a week or so.
When I used it the first few times, it worked well. But now, I only get empty pages with the expected title. What could be the cause? Are there any known conflicts with anything, such as other plugins or names on folders?

The only setting for the plugin, that I think is non-default, is the New File location, which is set to böcker. That folder exists, and book pages are stored there, both successfully created ones, and not so successfully created.

Used plugin version is 0.5.11.