Title: PHP Warning: session_start(): Cannot start session when headers already sent
Last modified: April 1, 2019

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# PHP Warning: session_start(): Cannot start session when headers already sent

 *  [mmagnani](https://wordpress.org/support/users/mmagnani/)
 * (@mmagnani)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/php-warning-session_start-cannot-start-session-when-headers-already-sent/)
 * Hello,
 * I have multiple PHP 7.2 FPM warnings like
 * `PHP Warning: session_start(): Cannot start session when headers already sent
   in (...)/wp-content/plugins/participants-database/vendor/wp-session-manager/wp-
   session-manager.php on line 46`
 * I’ve found some info [here](https://wordpress.org/support/topic/headers-already-sent-38/)
   but I’m not sure if it is related to it.
 * Could you please advise? Thanks!

Viewing 1 replies (of 1 total)

 *  Plugin Author [xnau webdesign](https://wordpress.org/support/users/xnau/)
 * (@xnau)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/php-warning-session_start-cannot-start-session-when-headers-already-sent/#post-11380300)
 * That can happen if you have errors getting printed to the screen or if you have
   a misbehaving plugin that is outputting to the screen when it shouldn’t. Try 
   deactivating other plugin to see what might be causing the problem.

Viewing 1 replies (of 1 total)

The topic ‘PHP Warning: session_start(): Cannot start session when headers already
sent’ 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/)
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 * 1 reply
 * 2 participants
 * Last reply from: [xnau webdesign](https://wordpress.org/support/users/xnau/)
 * Last activity: [7 years, 2 months ago](https://wordpress.org/support/topic/php-warning-session_start-cannot-start-session-when-headers-already-sent/#post-11380300)
 * Status: not resolved