Title: PHP Fatal error
Last modified: November 18, 2025

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# PHP Fatal error

 *  Resolved [eyejan](https://wordpress.org/support/users/eyejan/)
 * (@eyejan)
 * [6 months, 3 weeks ago](https://wordpress.org/support/topic/php-fatal-error-487/)
 * Could you please investigate this issue and verify why the callback is receiving
   a WP_Post_Type object instead of a WP_Term? It appears the filter is being triggered
   in a context where the second argument is not a term, which leads to the fatal
   error.
 * It would also be helpful if you could add the necessary type checks or fallbacks
   inside filter_course_category_term_link() to prevent the function from throwing
   a fatal error when unexpected data is passed. This would safeguard the site against
   similar failures in the future.
 * Please advise on next steps or provide a patch.
 * [17-Nov-2025 17:17:38 UTC] PHP Fatal error: Uncaught TypeError: TUTOR\Course_Filter::
   filter_course_category_term_link(): Argument #2 ($term) must be of type WP_Term,
   WP_Post_Type given, called in /var/www/vhosts/…/httpdocs/wp-includes/class-wp-
   hook.php on line 324 and defined in /var/www/vhosts/…/httpdocs/wp-content/plugins/
   tutor/classes/Course_Filter.php:338
   Stack trace: 0 /var/www/vhosts/…/httpdocs/
   wp-includes/class-wp-hook.php(324): TUTOR\Course_Filter::filter_course_category_term_link()
   1 /var/www/vhosts/…/httpdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters()
   2 /var/www/vhosts/…/httpdocs/wp-includes/taxonomy.php(4744): apply_filters() 
   3 /var/www/vhosts/…/httpdocs/wp-content/plugins/seo-by-rank-math/includes/frontend/
   paper/class-taxonomy.php(105): get_term_link() 4 /var/www/vhosts/…/httpdocs/wp-
   content/plugins/seo-by-rank-math/includes/frontend/paper/class-paper.php(372):
   RankMath\Paper\Taxonomy->canonical() 5 /var/www/vhosts/…/httpdocs/wp-content/
   plugins/seo-by-rank-math/includes/frontend/paper/class-paper.php(354): RankMath\
   Paper\Paper->generate_canonical() 6 /var/www/vhosts/…/httpdocs/wp-content/plugins/
   seo-by-rank-math/includes/replace-variables/class-post-variables.php(577): RankMath\
   Paper\Paper->get_canonical() 7 /var/www/vhosts/…/httpdocs/wp-content/plugins/
   seo-by-rank-math/includes/replace-variables/class-post-variables.php(108): RankMath\
   Replace_Variables\Post_Variables->get_url() 8 /var/www/vhosts/…/httpdocs/wp-content/
   plugins/seo-by-rank-math/includes/replace-variables/class-manager.php(119): RankMath\
   Replace_Variables\Post_Variables->setup_post_variables() 9 /var/www/vhosts/…/
   httpdocs/wp-includes/class-wp-hook.php(324): RankMath\Replace_Variables\Manager-
   >setup() 10 /var/www/vhosts/…/httpdocs/wp-includes/class-wp-hook.php(348): WP_Hook-
   >apply_filters() 11 /var/www/vhosts/…/httpdocs/wp-includes/plugin.php(565): WP_Hook-
   >do_action() 12 /var/www/vhosts/…/httpdocs/wp-includes/class-wp.php(835): do_action_ref_array()
   13 /var/www/vhosts/…/httpdocs/wp-includes/functions.php(1342): WP->main() 14 /
   var/www/vhosts/…/httpdocs/wp-blog-header.php(16): wp() 15 /var/www/vhosts/…/httpdocs/
   index.php(17): require(‘…’) 16 {main}
 * thrown in /var/www/vhosts/…/httpdocs/wp-content/plugins/tutor/classes/Course_Filter.
   php on line 338

Viewing 1 replies (of 1 total)

 *  [Maizul](https://wordpress.org/support/users/maizul/)
 * (@maizul)
 * [6 months, 3 weeks ago](https://wordpress.org/support/topic/php-fatal-error-487/#post-18726146)
 * Hey [@eyejan](https://wordpress.org/support/users/eyejan/) ,
 * Thank you for reporting this and for sharing the detailed error log. Based on
   the stack trace, it appears that another plugin or theme is filtering the taxonomy
   link in a way that passes a `WP_Post_Type` object instead of a `WP_Term`, which
   leads to the fatal error when Tutor LMS expects the second parameter to be a 
   valid term object.
 * To proceed, please first check for any plugin or theme conflicts, as we are not
   able to reproduce this issue on a clean installation with the latest Tutor LMS
   version. You can follow these steps:
    1. **Deactivate all plugins except Tutor LMS** and test again.
    2. If the issue disappears, reactivate plugins one-by-one to identify the conflicting
       one.
    3. **Switch temporarily to a default theme** such as Twenty Twenty-Five to rule
       out theme-related filters.

Viewing 1 replies (of 1 total)

The topic ‘PHP Fatal error’ is closed to new replies.

 * ![](https://ps.w.org/tutor/assets/icon-256x256.gif?rev=3193875)
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 * 1 reply
 * 2 participants
 * Last reply from: [Maizul](https://wordpress.org/support/users/maizul/)
 * Last activity: [6 months, 3 weeks ago](https://wordpress.org/support/topic/php-fatal-error-487/#post-18726146)
 * Status: resolved