Title: Undefined Index / Cannot Modify Header Info error
Last modified: December 1, 2022

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# Undefined Index / Cannot Modify Header Info error

 *  Resolved [jshields](https://wordpress.org/support/users/jshields/)
 * (@jshields)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-index-cannot-modify-header-info-error/)
 * Hello,
 * I get this error in the top of my dashboard and it prevents me from opening some
   posts to edit them – I get a white page with this error. I can disable the plugin
   to get around the issue if needed, but still have it live on the site. Let me
   know how to proceed, thanks!
 * Notice: Undefined index: post_type in /home/customer/www/infosol.com/public_html/
   wp-content/plugins/cleantalk-spam-protect/inc/cleantalk-public-integrations.php
   on line 3598
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/customer/www/infosol.com/public_html/wp-content/plugins/cleantalk-spam-
   protect/inc/cleantalk-public-integrations.php:3598) in /home/customer/www/infosol.
   com/public_html/wp-admin/includes/misc.php on line 1416
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fundefined-index-cannot-modify-header-info-error%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  Plugin Support [eugenecleantalk](https://wordpress.org/support/users/eugenecleantalk/)
 * (@eugenecleantalk)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-index-cannot-modify-header-info-error/#post-16252798)
 * Hello [@jshields](https://wordpress.org/support/users/jshields/).
 * We will analyze the data and contact you within 24 hours.
 *  Plugin Support [eugenecleantalk](https://wordpress.org/support/users/eugenecleantalk/)
 * (@eugenecleantalk)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-index-cannot-modify-header-info-error/#post-16255436)
 * We need additional details about your website to solve the issue.
    Please contact
   us via our private Ticket System: [https://cleantalk.org/my/support/open](https://cleantalk.org/my/support/open).
   Could you add a link to this topic, so we can identify you quickly?
 *  Plugin Support [sergecleantalk](https://wordpress.org/support/users/sergecleantalk/)
 * (@sergecleantalk)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-index-cannot-modify-header-info-error/#post-16267386)
 * Hello,
 * We received your ticket. We will continue working there.

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

The topic ‘Undefined Index / Cannot Modify Header Info error’ is closed to new replies.

 * ![](https://ps.w.org/cleantalk-spam-protect/assets/icon-256x256.png?rev=1637702)
 * [Spam protection, Honeypot, Anti-Spam by CleanTalk](https://wordpress.org/plugins/cleantalk-spam-protect/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/cleantalk-spam-protect/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/cleantalk-spam-protect/)
 * [Active Topics](https://wordpress.org/support/plugin/cleantalk-spam-protect/active/)
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## Tags

 * [Cannot modify header information](https://wordpress.org/support/topic-tag/cannot-modify-header-information/)
 * [undefined index](https://wordpress.org/support/topic-tag/undefined-index/)

 * 3 replies
 * 2 participants
 * Last reply from: [sergecleantalk](https://wordpress.org/support/users/sergecleantalk/)
 * Last activity: [3 years, 5 months ago](https://wordpress.org/support/topic/undefined-index-cannot-modify-header-info-error/#post-16267386)
 * Status: resolved