I'm getting the fatal error "Critical Object of class WP_Error could not be converted to string".

The theme is developed with twig and php files, to separate logic from visual. Somehow, in the frontend, there's no error, but I receive everyday this fatal error in the logs.

The error is in single-color.php:

$term = wp_get_post_terms( $colection->posts[0]->ID ,'look' ); 

echo'<span property="itemListElement" typeof="ListItem"><a property="item" typeof="WebPage" title="Go to '.$term[0]->name.'"href="'.get_term_link( $term[0]->term_id).'" class="home"><span property="name">'.$term[0]->name.'</span></a><meta property="position" content="3"></span> > ';

Is there anyway to deal with this situation, just to avoid the logs?

1 Answer 1


wp_get_post_terms() returns a WP_Error on failure. (Are you sure it's $colection and not $collection in that function call?)

You can check the return value using is_wp_error() and decide what you're going to output if it is, in fact, a WP_Error.

For example:

$term = wp_get_post_terms( $colection->posts[0]->ID ,'look' ); 

if ( is_wp_error( $term ) ) {

    echo 'Error: ' . $term->get_error_message();

} else {

    echo '<span property="itemListElement" typeof="ListItem">
          <a property="item" typeof="WebPage" title="Go to ' .
          $term[0]->name . '"href="' . 
          get_term_link( $term[0]->term_id).'" class="home">
          <span property="name">'.$term[0]->name.'</span>
          <meta property="position" content="3"></span> > ';
    // Lines broken up for readability

  • 1
    I know colection should have two "l" but the variable was defined as "colection". Anyway, your suggestion worked. The fatal error doesn't exist anymore. Thank you. Commented Mar 6, 2023 at 9:35
  • Glad you got it fixed. (I only asked about $colection because I know sometimes it's hard to find the typos in your own code.)
    – Pat J
    Commented Mar 6, 2023 at 16:39

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