Search does not work anymore.

While the categories "tag cloud"
(via https://userstyles.org/api/v1/categories/site)
gets loaded in the Stylish extension interface,

a search
(via https://userstyles.org/api/v1/styles/subcategory?search=fritz&per_page=22&country=us&page=1)
returns a fatal error in the JSON result set.
{"error":"fatal error"}