- Commerce -> Sites -> Sites
- Create a new site using Minium theme
- Enter the site you've just created -> Catalog
- Click on Search Results widget menu button
- Click on Configuration in the dropdown
- Set Pagination Type value as 'Regular' -> Save
- Change the page (don't use previous/next or first/last) or the number of items per page
Changing page or items per page should work.
You'll be redirected to an error page.