Title: Cannot modify header information
Last modified: August 3, 2021

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# Cannot modify header information

 *  Resolved [sonicavatar](https://wordpress.org/support/users/sonicavatar/)
 * (@sonicavatar)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-173/)
 * Receiving this in my live environment, after being able to make some updates 
   in our live production environment, and also after doing testing in Local, where
   I didn’t get this error. Receiving now when trying to update “Save Site Map”
 * Notice: Undefined index: value in ourwebsite.com.au/public_html/wp-content/plugins/
   wp-google-maps-pro/includes/map-edit-page/class.pro-map-edit-page.php on line
   128
 * Warning: Cannot modify header information – headers already sent by (output started
   at ourwebsite.com.au/public_html/wp-content/plugins/wp-google-maps-pro/includes/
   map-edit-page/class.pro-map-edit-page.php:128) in ourwebsite.com.au/public_html/
   wp-includes/pluggable.php on line 1329

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [sonicavatar](https://wordpress.org/support/users/sonicavatar/)
 * (@sonicavatar)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-173/#post-14728613)
 * Happens for one of our maps (e.g. Map 1), and not for another (Map 2), which 
   was newly added as a test.
 *  [stevendebeer](https://wordpress.org/support/users/stevendebeer/)
 * (@stevendebeer)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-173/#post-14728678)
 * Hi [@sonicavatar](https://wordpress.org/support/users/sonicavatar/),
 * Thank you so much for getting in touch, we really appreciate your time.
 * Unfortunately, due to mentions of our Pro add-on and its features, this thread
   would be considered a premium support question. We cannot discuss Pro features
   or issues as per the WordPress.org support guidelines, these forums are reserved
   for the base plugin and its features only, meaning we are not allowed to provide
   any support for the Pro add-on here.
 * Might I kindly suggest getting in touch via our website where one of our agents
   will be more than happy to assist with your questions?
 * Note: This support query will be marked as resolved as it pertains to our Pro
   add-on, under the WordPress.org guidelines, no premium support is allowed via
   these forums.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Cannot modify header information’ is closed to new replies.

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 * 2 replies
 * 2 participants
 * Last reply from: [stevendebeer](https://wordpress.org/support/users/stevendebeer/)
 * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-173/#post-14728678)
 * Status: resolved