Title: Plugin display errors since upgrading WordPress to Version 4.9.4
Last modified: February 9, 2018

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# Plugin display errors since upgrading WordPress to Version 4.9.4

 *  Resolved [rightbiz](https://wordpress.org/support/users/rightbiz/)
 * (@rightbiz)
 * [8 years, 4 months ago](https://wordpress.org/support/topic/plugin-display-errors-since-upgrading-wordpress-to-version-4-9-4/)
 * Hello Donncha Ó Caoimh,
 * I’ve been using your brilliant “wordpress-mu-domain-mapping” plugin on my Hostgator
   shared account, without any incident for a few months.
 * But since updating WordPress on my Hostgator shared account, (PHPv 5.6.30) to
   the latest WP verson a day or two ago, I keep getting these display errors in
   the Tools/Domain Mapping Admin area:
 * =============================
    Notice: Undefined index: action in /……/……./public_html/
   wp-content/plugins/wordpress-mu-domain-mapping/domain_mapping.php on line 373
 * Warning: Cannot modify header information – headers already sent by (output started
   at /……/……./public_html/wp-content/plugins/wordpress-mu-domain-mapping/domain_mapping.
   php:373) in /……/……./public_html/wp-admin/includes/misc.php on line 1114
 * Notice: Undefined index: path in /……/……./public_html/wp-content/plugins/wordpress-
   mu-domain-mapping/domain_mapping.php on line 447
 * Notice: Undefined index: path in /……/……./public_html/wp-content/plugins/wordpress-
   mu-domain-mapping/domain_mapping.php on line 462
    ===========================
   ==
 * Regardless, the pluging is working fine and all Domains “Primary” or otherwise,
   all point to their respective mapped Sub Domains without any problem.
 * It’s just the display errors that concern me.
 * Is their any lines of php code I can replace to rectivy this?
 * Thank you so much for your time.
 * Best regards,
    Stanley E Kennedy
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fplugin-display-errors-since-upgrading-wordpress-to-version-4-9-4%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Thread Starter [rightbiz](https://wordpress.org/support/users/rightbiz/)
 * (@rightbiz)
 * [8 years, 4 months ago](https://wordpress.org/support/topic/plugin-display-errors-since-upgrading-wordpress-to-version-4-9-4/#post-9955310)
 * Sorry, some additional errors via cron / email notification:
 * Notice: Undefined index: HTTP_HOST in /……/……./public_html/wp-content/sunrise.
   php on line 10
 * Notice: Undefined index: HTTP_HOST in /……/……./public_html/wp-includes/ms-settings.
   php on line 57
 * Warning: Cannot modify header information – headers already sent by (output started
   at /……/……./public_html/wp-content/sunrise.php:10) in /……/……./public_html/wp-includes/
   ms-settings.php on line 79
 * Hope this info is useful to help resolve this issue.
 *  Plugin Author [Ron Rennick](https://wordpress.org/support/users/wpmuguru/)
 * (@wpmuguru)
 * [8 years, 4 months ago](https://wordpress.org/support/topic/plugin-display-errors-since-upgrading-wordpress-to-version-4-9-4/#post-9957075)
 * Hostgator turned on printing warnings when they updated PHP. Ask HG support if
   warnings can be turned off.
 *  Thread Starter [rightbiz](https://wordpress.org/support/users/rightbiz/)
 * (@rightbiz)
 * [8 years, 4 months ago](https://wordpress.org/support/topic/plugin-display-errors-since-upgrading-wordpress-to-version-4-9-4/#post-9961221)
 * Thanks for your reply Ron,
 * I had already turned off PHP Display errors in the php.ini file. But the solution
   was right in the WP Config file, changed the “define(‘WP_DEBUG’, true);” to “
   define(‘WP_DEBUG’, false);”. Now it’s all good 🙂
 * Best,
    Stan

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Plugin display errors since upgrading WordPress to Version 4.9.4’ is 
closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/wordpress-mu-domain-mapping.svg)
 * [WordPress MU Domain Mapping](https://wordpress.org/plugins/wordpress-mu-domain-mapping/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wordpress-mu-domain-mapping/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wordpress-mu-domain-mapping/)
 * [Active Topics](https://wordpress.org/support/plugin/wordpress-mu-domain-mapping/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wordpress-mu-domain-mapping/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wordpress-mu-domain-mapping/reviews/)

 * 3 replies
 * 2 participants
 * Last reply from: [rightbiz](https://wordpress.org/support/users/rightbiz/)
 * Last activity: [8 years, 4 months ago](https://wordpress.org/support/topic/plugin-display-errors-since-upgrading-wordpress-to-version-4-9-4/#post-9961221)
 * Status: resolved