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Most likely the problem comes from: $terms = get_the_terms( $post->ID, $args['taxonomy'] ); i.e. you have to make sure it's not false or WP_Error object. You should also check the output of: var_dump( $args ); Try for example: if( ! is_array( $terms ) ) return $output; or if( ! $terms || is_wp_error( $terms ) ) return $output; ...

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