get_post_meta not working on category.php

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I’m referencing an attached image in my header.php page which is displayed as a full screen background on my posts: 

global $wp_query;
$page_id = $wp_query->get_queried_object_id();
$background_image = get_post_meta( $page_id, 'mb_background_image', true );
$src = wp_get_attachment_image_src( $background_image, 'full' );

This works fine on single posts, but doesn’t work when displaying just one post per page in category.php.

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How can I fix this?

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1 comment

  1. The $page_id variable wasn’t defined in category.php so I changed as seen below:

    $background_image = get_post_meta( $post->ID, 'mb_background_image', true );