Im trying to make my next and previous post buttons display my custom field but for some reason it doesnt display the custom field its just blank. Heres my code.

<div id="next-prev-links">

      $previous_post = previous_post_link('%link', ''.$image_prev.'', TRUE);
      $next_post = next_post_link('%link',''.$image_next.'', TRUE);
      $image_prev = get_post_meta( $previous_post->ID, 'image', true);
      $image_next = get_post_meta( $next_post->ID, 'image', true);

      <?php if ( $image_prev != '' ) : ?>
        <img src="<?php echo $image_prev; ?>" alt="" />
      <?php endif; ?>

      <?php if ( $image_next != '' ) : ?>
        <img src="<?php echo $image_next; ?>" alt="" />
      <?php endif; ?>

      <?php previous_post_link('%link', 'Previous post', TRUE); ?>
      <?php next_post_link('%link', 'Next post', TRUE); ?>

Here's the code for what you're trying to do (accessing post custom value):

global $post;

    $prev_post = get_adjacent_post();
    $next_post = get_adjacent_post( false, '', false );
    $prev_post_id = $prev_post->ID;
    $next_post_id = $next_post->ID;
    // this should, according to your code above, be the http://example.com/your/img.jpg string
    $prev_img_path = get_post_custom_values( 'your_key_name', $prev_post_id );
    $next_img_path = get_post_custom_values( 'your_key_name', $next_post_id );
    $prev_def_path = get_bloginfo('stylesheet_directory').'/default_next_img_inside_theme_folder.jpg';
    $next_def_path = get_bloginfo('stylesheet_directory').'/default_prev_img_inside_theme_folder.jpg';

    echo '<img src="'.!empty($prev_img_path) ? $prev_img_path : $prev_def_path.'" alt="Permalink to previous post" />';
    echo '<img src="'.!empty($next_def_path) ? $next_def_path : $next_img_path.'" alt="Permalink to next post" />';

I think you are trying to retrieve ID from link string that *_post_link() functions return, rather than post object.

If you need full object of next/previous post you should use get_adjacent_post().

PS it is good practice to develop with WP_DEBUG enabled, it makes much easier to catch type mismatches.

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