Title: PHP Warning: Cannot modify header information – headers already sent
Last modified: February 8, 2017

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# PHP Warning: Cannot modify header information – headers already sent

 *  [JensGoro](https://wordpress.org/support/users/jensgoro/)
 * (@jensgoro)
 * [9 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-headers-already-sent-2/)
 * I become an PHP Error and doesn’t know it’s Theme or Plugin related?
 * PHP Warning: Cannot modify header information – headers already sent by (output
   started at *****/wp-admin/includes/template.php:1995) in /*****/wp-content/plugins/
   magic-post-thumbnail/magic_post_thumbnail.php on line 400

Viewing 1 replies (of 1 total)

 *  [vgrillo](https://wordpress.org/support/users/vgrillo/)
 * (@vgrillo)
 * [9 years, 2 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-headers-already-sent-2/#post-8945275)
 * I’ve got exactly the same Warning message using this plugin along with FeedWordPress.
 * Any clues about it?
 * Thanks.

Viewing 1 replies (of 1 total)

The topic ‘PHP Warning: Cannot modify header information – headers already sent’
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 * ![](https://ps.w.org/magic-post-thumbnail/assets/icon-256x256.png?rev=3183991)
 * [Generate Images (AI) - Magic Post Thumbnail](https://wordpress.org/plugins/magic-post-thumbnail/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/magic-post-thumbnail/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/magic-post-thumbnail/)
 * [Active Topics](https://wordpress.org/support/plugin/magic-post-thumbnail/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/magic-post-thumbnail/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/magic-post-thumbnail/reviews/)

## Tags

 * [headers already sent](https://wordpress.org/support/topic-tag/headers-already-sent/)

 * 2 replies
 * 2 participants
 * Last reply from: [vgrillo](https://wordpress.org/support/users/vgrillo/)
 * Last activity: [9 years, 2 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-headers-already-sent-2/#post-8945275)
 * Status: not resolved