Cannot modify header information – headers already sent by

  • Eugene

    (@eugenemolari)


    WCLDN 2018 Contributor

    7 years, 5 months ago

    Hi Dean,

    Hope you well.

    First of all thanks a lot for the amazing plugin, I love it.

    I’d like to share a bug I noticed and fixed myself if it helps.

    I ran your plugin on a website I was developing a theme for.

    Once I enabled WP-DEBUG I noticed the following error:

    WARNING: wp-admin/admin-header.php:9 – Cannot modify header information – headers already sent by (output started at /Users/Eugene/Documents/MAMP PRO/hlcchlsass/wp-content/plugins/photoswipe-masonry/photoswipe-masonry.php:178)
    require_once(‘wp-admin/admin-header.php’), header

    I could not find anything wrong with your code but then I realised I purposely omitted the value for “Thumbnail Height” on the plugin admin page and that’s what caused the error.

    Once I added a value to the field everything went back to normal.

    Hopefully no one will experience this bug but I thought I’d share my experience just in case.

    Thanks again.

    Best,

    Eugene

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