Title: Error in debug log
Last modified: September 26, 2025

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# Error in debug log

 *  Resolved [brad hogan](https://wordpress.org/support/users/bradley2083/)
 * (@bradley2083)
 * [8 months ago](https://wordpress.org/support/topic/error-in-debug-log-35/)
 * Hey, there. Seeing this error on the settings page and I don’t appear to see 
   the save button as probably a result of this error.
 * **Fatal error**: Uncaught Error: Undefined constant “AUTH_KEY” in /Users/bradhogan/
   Documents/Websites/wp-default/app/public/wp-content/plugins/image-source-control-
   isc/includes/log.php:17 Stack trace: #0 /Users/bradhogan/Documents/Websites/wp-
   default/app/public/wp-content/plugins/image-source-control-isc/includes/log.php(
   97): ISC_Log::get_file_name() #1 /Users/bradhogan/Documents/Websites/wp-default/
   app/public/wp-content/plugins/image-source-control-isc/includes/settings/sections/
   miscellaneous.php(60): ISC_Log::get_log_file_url() #2 /Users/bradhogan/Documents/
   Websites/wp-default/app/public/wp-admin/includes/template.php(1836): ISC\Settings\
   Sections\Miscellaneous->render_field_enable_log(Array) #3 /Users/bradhogan/Documents/
   Websites/wp-default/app/public/wp-content/plugins/image-source-control-isc/admin/
   templates/settings/settings.php(37): do_settings_fields(‘isc_settings_pa…’, ‘
   isc_settings_se…’) #4 /Users/bradhogan/Documents/Websites/wp-default/app/public/
   wp-content/plugins/image-source-control-isc/includes/settings.php(62): require_once(‘/
   Users/bradhoga…’) #5 /Users/bradhogan/Documents/Websites/wp-default/app/public/
   wp-includes/class-wp-hook.php(324): ISC\Settings->render_settings_page(”) #6 /
   Users/bradhogan/Documents/Websites/wp-default/app/public/wp-includes/class-wp-
   hook.php(348): WP_Hook->apply_filters(”, Array) #7 /Users/bradhogan/Documents/
   Websites/wp-default/app/public/wp-includes/plugin.php(517): WP_Hook->do_action(
   Array) #8 /Users/bradhogan/Documents/Websites/wp-default/app/public/wp-admin/
   admin.php(260): do_action(‘settings_page_i…’) #9 /Users/bradhogan/Documents/Websites/
   wp-default/app/public/wp-admin/options-general.php(10): require_once(‘/Users/
   bradhoga…’) #10 {main} thrown in **/Users/bradhogan/Documents/Websites/wp-default/
   app/public/wp-content/plugins/image-source-control-isc/includes/log.php** on 
   line **17**

Viewing 1 replies (of 1 total)

 *  Plugin Author [Thomas Maier](https://wordpress.org/support/users/webzunft/)
 * (@webzunft)
 * [8 months ago](https://wordpress.org/support/topic/error-in-debug-log-35/#post-18658650)
 * Hi Brad,
 * thanks for reaching out.
 * `AUTH_KEY` is a constant defined in WordPress’ `wp-config.php` file. It is used
   by WordPress core itself, as well as by many other plugins to generate unique
   values. It is likely, that there can be more warnings like this that don’t involve
   Image Source Control.
 * Please open the `wp-config.php` file in the root directory of your WordPress 
   installation and search for `AUTH_KEY`. You should find a line like this:
 * `define( 'AUTH_KEY', 'put your unique phrase here' );`
 * If that’s not there, you can take the appropriate code block from `wp-config-
   sample.php`.
 * Please let me know if that works.
 * Thanks,
   Thomas

Viewing 1 replies (of 1 total)

The topic ‘Error in debug log’ is closed to new replies.

 * ![](https://ps.w.org/image-source-control-isc/assets/icon.svg?rev=2694143)
 * [Image Source Control Lite – Show Image Credits and Captions](https://wordpress.org/plugins/image-source-control-isc/)
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 * 1 reply
 * 2 participants
 * Last reply from: [Thomas Maier](https://wordpress.org/support/users/webzunft/)
 * Last activity: [8 months ago](https://wordpress.org/support/topic/error-in-debug-log-35/#post-18658650)
 * Status: resolved