Title: Critical error “singular_name”
Last modified: February 11, 2025

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# Critical error “singular_name”

 *  Resolved [Webtaurus](https://wordpress.org/support/users/and_or/)
 * (@and_or)
 * [1 year, 3 months ago](https://wordpress.org/support/topic/crutical-error/)
 * For your info:
 * Editing posts/cpts etc. gave a critical error:
   `Warning: Attempt to read property"
   singular_name" on null in ././plugins/post-duplicator/includes/edit.php on line
   36`
 * Had to disable Post-duplicator to get things working again.
   Was working until
   yesterday (feb 10 25)WP Multisite – everything updated
    -  This topic was modified 1 year, 3 months ago by [Webtaurus](https://wordpress.org/support/users/and_or/).

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

 *  Thread Starter [Webtaurus](https://wordpress.org/support/users/and_or/)
 * (@and_or)
 * [1 year, 3 months ago](https://wordpress.org/support/topic/crutical-error/#post-18298310)
 * Solved – not a plugin error. Somebody used a reserved slug in a cpt declaration,
   which caused the error.
 *  Plugin Author [metaphorcreations](https://wordpress.org/support/users/metaphorcreations/)
 * (@metaphorcreations)
 * [1 year, 3 months ago](https://wordpress.org/support/topic/crutical-error/#post-18298979)
 * Thanks for the follow up!
 * I’m going to release a small update just to ensure something like this won’t 
   cause a critical error again.

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

The topic ‘Critical error “singular_name”’ is closed to new replies.

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 * 2 replies
 * 2 participants
 * Last reply from: [metaphorcreations](https://wordpress.org/support/users/metaphorcreations/)
 * Last activity: [1 year, 3 months ago](https://wordpress.org/support/topic/crutical-error/#post-18298979)
 * Status: resolved