Title: PHP Warning Message
Last modified: July 29, 2018

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# PHP Warning Message

 *  Resolved [premierweb](https://wordpress.org/support/users/premierweb/)
 * (@premierweb)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/)
 * Hi,
 * I am receiving the error following message from one of my websites:
 * —-
 * PHP Warning: Cannot modify header information – headers already sent by (output
   started at
    /home/fnqorg/public_html/wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/
   psr7/src/functions.php:78) in /home/fnqorg/public_html/wp-content/plugins/participants-
   database/classes/WP_Session.class.php on line 123
 * —-
 * Participants database used is version Version 1.5.4.9
 * Could you please assist? I am unsure what is causing this error.
 * Thanks,
    Joanne

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Plugin Author [xnau webdesign](https://wordpress.org/support/users/xnau/)
 * (@xnau)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10537182)
 * This is an issue that can happen when more than one plugin tries to set a browser
   cookie. I fixed this issue some time ago, I suggest you update your Participants
   Database.
 *  Thread Starter [premierweb](https://wordpress.org/support/users/premierweb/)
 * (@premierweb)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10537198)
 * thanks for your quick reply.
 * What is the latest version number?
 *  Plugin Author [xnau webdesign](https://wordpress.org/support/users/xnau/)
 * (@xnau)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10538163)
 * Participants Database is at 1.7.9.7
 * The update should show up on your plugins page, you can do the update from there.
 *  Thread Starter [premierweb](https://wordpress.org/support/users/premierweb/)
 * (@premierweb)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10538592)
 * Thanks, I’ve done the update now.
 * There is an issue that has come up that I would like your assistance with please.
   Can I message you privately to discuss this website?
 *  Plugin Author [xnau webdesign](https://wordpress.org/support/users/xnau/)
 * (@xnau)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10538848)
 * Contact me by email at [support@xnau.com](https://wordpress.org/support/topic/php-warning-message-4/support@xnau.com?output_format=md)
 *  Thread Starter [premierweb](https://wordpress.org/support/users/premierweb/)
 * (@premierweb)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10538888)
 * Thanks. I’ve just emailed you.

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘PHP Warning Message’ is closed to new replies.

 * ![](https://ps.w.org/participants-database/assets/icon-256x256.jpg?rev=1389807)
 * [Participants Database](https://wordpress.org/plugins/participants-database/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/participants-database/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/participants-database/)
 * [Active Topics](https://wordpress.org/support/plugin/participants-database/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/participants-database/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/participants-database/reviews/)

 * 6 replies
 * 2 participants
 * Last reply from: [premierweb](https://wordpress.org/support/users/premierweb/)
 * Last activity: [7 years, 10 months ago](https://wordpress.org/support/topic/php-warning-message-4/#post-10538888)
 * Status: resolved