Page Unresponsive and Crashes on Book Info Page

Hi there
We experience Page Unresponsive Errors and Crashes on the Book Info page, since Release 6.16.0

Steps to reproduce the crash almost immediatly:

  • Open Book Info page
  • Scroll to Subjects
  • Click in Additional Subjects
  • Impatiently click somewhere else → Page Unresponsive Error


We are able to reproduce it on a fresh installation. Does anyone else experience the same problem?

Let me know if I can provide further information.

Hi @STC-Digital that release replaced the old combo boxes used in the book info page with a custom-build, more accessible web component: @pressbooks/multiselect - npm. Depending on your installation method, it may not be present in your build. We strongly encourage people to use Bedrock
-based installs and manage dependencies with Composer
when self-hosting. If you have server access you could also try going into the directory where Pressbooks is installed and running npm i and composer install && composer update to see whether the issue was missing or un-updated dependencies? If not – can you share the diagnostics page for your install (you can find it at https://YOURNETWORK.URL/wp-admin/options.php?page=pressbooks_diagnostics along with screenshots of any error messages you see in the browser console when viewing the book info or other pages that are having problems?