Title: Undefined array key “post_type”
Last modified: November 14, 2022

---

# Undefined array key “post_type”

 *  Resolved [Roger Scout](https://wordpress.org/support/users/roger-scout/)
 * (@roger-scout)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/undefined-array-key-post_type-2/)
 * There are no problems when you enter the page as a visitor, then everything works.
   
   But when you enter pages in the administration mode, the below warning comes 
   up. When you disable the Staff list plug-in, the problem disappears. PHP 8.0 
   and version of Staf list is 1.6.8
 * Warning: Undefined array key “post_type” in /httpd.www/wp-content/plugins/staff-
   list/staff-list.php on line 516
 * Warning: Undefined array key “post_type” in /httpd.www/wp-content/plugins/staff-
   list/staff-list.php on line 516
 * Warning: Cannot modify header information – headers already sent by (output started
   at /httpd.www/wp-content/plugins/staff-list/staff-list.php:516) in /httpd.www/
   wp-admin/includes/misc.php on line 1416
 * Warning: Cannot modify header information – headers already sent by

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [abcfolio](https://wordpress.org/support/users/abcfolio/)
 * (@abcfolio)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/undefined-array-key-post_type-2/#post-16220769)
 * Unfortunately we can’t reproduce the error. The array key ‘post_type’ is a part
   of WP_Query object and should be always present unless the query has been modified
   before hitting ‘parse_query’ filter.
 * Have you tried deactivating all the other plugins one by one?
 *  Plugin Author [abcfolio](https://wordpress.org/support/users/abcfolio/)
 * (@abcfolio)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-array-key-post_type-2/#post-16266162)
 * Closed due to inactivity.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Undefined array key “post_type”’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/staff-list_0d336f.svg)
 * [Staff List](https://wordpress.org/plugins/staff-list/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/staff-list/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/staff-list/)
 * [Active Topics](https://wordpress.org/support/plugin/staff-list/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/staff-list/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/staff-list/reviews/)

## Tags

 * [post_type](https://wordpress.org/support/topic-tag/post_type/)

 * 2 replies
 * 2 participants
 * Last reply from: [abcfolio](https://wordpress.org/support/users/abcfolio/)
 * Last activity: [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-array-key-post_type-2/#post-16266162)
 * Status: resolved