Killed the site

Hello!

I have got this email when trying to enter a quiz’

Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, HD Quiz.

First, visit your website (http://mysite.com/) and check for any visible issues. Next, visit the page where the error was caught (http://mysite.com/wp-admin/admin.php?page=hdq_quizzes) and check for any visible issues.

Please contact your host for assistance with investigating this issue further.

If your site appears broken and you can’t access your dashboard normally, WordPress now has a special “recovery mode”. This lets you safely login to your dashboard and investigate further.

http://mysite.com/wp-login.php?action=enter_recovery_mode&rm_token=pnbKl320v2ZT8SusGr2K2G&rm_key=IzpE9DreB5dU0l5vNsi6Gu

To keep your site safe, this link will expire in 1 day. Don’t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

Error Details
=============
An error of type E_ERROR was caused in line 49 of the file /home/x/mysite.com/wp-content/plugins/hd-quiz/includes/hdq_quizzes.php. Error message: Uncaught Error: Call to undefined function mb_strimwidth() in /home/x/mysite.com/wp-content/plugins/hd-quiz/includes/hdq_quizzes.php:49
Stack trace:
#0 /home/x/mysite.com/wp-content/plugins/hd-quiz/index.php(138): require()
#1 /home/x/mysite.com/wp-includes/class-wp-hook.php(286): hdq_register_quizzes_page_callback(”)
#2 /home/x/mysite.com/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array)
#3 /home/x/mysite.com/wp-includes/plugin.php(465): WP_Hook->do_action(Array)
#4 /home/x/mysite.com/wp-admin/admin.php(253): do_action(‘toplevel_page_h…’)
#5 {main}
thrown

I have uninstalled the plugin.
However, I would like to test it… As it looks nice.

(I am texting Quiz Cat now…)

Greetings and thanks

Tamas