404 page box

  • Hi,

    I want to trigger a pop up box when users are directed to the 404 page on my site. I am not sure how to trigger that?

    Do I have to use some version of this:

    add_filter( ‘boxzilla_show_box_$box_957’, function( $load ) {
    return ! is_404();
    });

    It is not working so any help would be appreciated!

    Thanks ??

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