Title: Cannot modify header information
Last modified: November 9, 2021

---

# Cannot modify header information

 *  Resolved [hinemann](https://wordpress.org/support/users/hinemann/)
 * (@hinemann)
 * [4 years, 7 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-174/)
 * Hello there,
 * instead of my admin login page, I see these error messages associated with Sonaar
   Music Player:
    —
 *     ```
       Warning: array_key_exists() expects parameter 2 to be array, string given in /homepages/45/d4295164981/htdocs/dominik-matzka.de/wp-content/plugins/mp3-music-player-by-sonaar/admin/class-sonaar-music-admin.php on line 1295
   
       Warning: Cannot modify header information - headers already sent by (output started at /homepages/45/d4295164981/htdocs/dominik-matzka.de/wp-content/plugins/mp3-music-player-by-sonaar/admin/class-sonaar-music-admin.php:1295) in /homepages/45/d4295164981/htdocs/dominik-matzka.de/wp-includes/pluggable.php on line 1340
   
       Warning: Cannot modify header information - headers already sent by (output started at /homepages/45/d4295164981/htdocs/dominik-matzka.de/wp-content/plugins/mp3-music-player-by-sonaar/admin/class-sonaar-music-admin.php:1295) in /homepages/45/d4295164981/htdocs/dominik-matzka.de/wp-includes/pluggable.php on line 1343
       ```
   
 * —
    The plugin works well, by the way. However, can you tell me how to get rid
   of these annoying messages? I’ve tried to troubleshoot them myself using this
   link – [https://wordpress.org/support/article/faq-troubleshooting/#top](https://wordpress.org/support/article/faq-troubleshooting/#top)–
   but wasn’t able to identify any “spaces, new lines, or other stuff” in line 1295.
   This is the code from line 1295:
 * —
    if( array_key_exists(‘artist_of_album’, $meta) ){ //If album post has been
   created by sonaar theme —
 * Thanks a lot in advance!
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcannot-modify-header-information-174%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  Plugin Author [sonaar](https://wordpress.org/support/users/sonaar/)
 * (@sonaar)
 * [4 years, 7 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-174/#post-15052728)
 * Hi,
 * Are you using the Sonaar theme as well?
 * Could you please open a support ticket at [https://support.sonaar.io](https://support.sonaar.io)
   and I’ll check in details what the issue is.
 * Thanks
 * Max
 *  Thread Starter [hinemann](https://wordpress.org/support/users/hinemann/)
 * (@hinemann)
 * [4 years, 7 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-174/#post-15054019)
 * Hi Max,
 * alright, I’ve just opened a support ticket there.
    I am currently using the Hitchcock
   theme.
 * Dominik

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

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

 * ![](https://ps.w.org/mp3-music-player-by-sonaar/assets/icon.svg?rev=1865553)
 * [MP3 Audio Player – Music Player, Podcast Player & Radio by Sonaar](https://wordpress.org/plugins/mp3-music-player-by-sonaar/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/mp3-music-player-by-sonaar/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/mp3-music-player-by-sonaar/)
 * [Active Topics](https://wordpress.org/support/plugin/mp3-music-player-by-sonaar/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/mp3-music-player-by-sonaar/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/mp3-music-player-by-sonaar/reviews/)

## Tags

 * [Cannot modify header information](https://wordpress.org/support/topic-tag/cannot-modify-header-information/)
 * [headers already sent by](https://wordpress.org/support/topic-tag/headers-already-sent-by/)

 * 2 replies
 * 2 participants
 * Last reply from: [hinemann](https://wordpress.org/support/users/hinemann/)
 * Last activity: [4 years, 7 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-174/#post-15054019)
 * Status: resolved