error in 5.1.0 update

John,

I too am experiencing this on a custom post type. Here is my var_dump:

object(stdClass)#5759 (29) { ["ID"]=> int(0) ["post_status"]=> string(5) "draft" ["post_author"]=> int(0) ["post_parent"]=> int(0) ["post_type"]=> string(4) "page" ["post_date"]=> int(0) ["post_date_gmt"]=> int(0) ["post_modified"]=> int(0) ["post_modified_gmt"]=> int(0) ["post_content"]=> string(0) "" ["post_title"]=> string(0) "" ["post_excerpt"]=> string(0) "" ["post_content_filtered"]=> string(0) "" ["post_mime_type"]=> string(0) "" ["post_password"]=> string(0) "" ["post_name"]=> string(0) "" ["guid"]=> string(0) "" ["menu_order"]=> int(0) ["pinged"]=> string(0) "" ["to_ping"]=> string(0) "" ["ping_status"]=> string(0) "" ["comment_status"]=> string(6) "closed" ["comment_count"]=> int(0) ["is_404"]=> bool(false) ["is_page"]=> bool(false) ["is_single"]=> bool(false) ["is_archive"]=> bool(false) ["is_tax"]=> bool(false) ["filter"]=> string(3) "raw" } object(stdClass)#5759 (29) { ["ID"]=> int(0) ["post_status"]=> string(5) "draft" ["post_author"]=> int(0) ["post_parent"]=> int(0) ["post_type"]=> string(4) "page" ["post_date"]=> int(0) ["post_date_gmt"]=> int(0) ["post_modified"]=> int(0) ["post_modified_gmt"]=> int(0) ["post_content"]=> string(0) "" ["post_title"]=> string(0) "" ["post_excerpt"]=> string(0) "" ["post_content_filtered"]=> string(0) "" ["post_mime_type"]=> string(0) "" ["post_password"]=> string(0) "" ["post_name"]=> string(0) "" ["guid"]=> string(0) "" ["menu_order"]=> int(0) ["pinged"]=> string(0) "" ["to_ping"]=> string(0) "" ["ping_status"]=> string(0) "" ["comment_status"]=> string(6) "closed" ["comment_count"]=> int(0) ["is_404"]=> bool(false) ["is_page"]=> bool(false) ["is_single"]=> bool(false) ["is_archive"]=> bool(false) ["is_tax"]=> bool(false) ["filter"]=> string(3) "raw" }

To fix this, I updated these lines (Line 358 on class.bcn_breadcrumb_trail.php):

protected function do_post(WP_Post $post)
{

and changes to:

protected function do_post($post)
{
if (get_class($post) != “WP_Post”) return;

This resolved issues for me.

I am having this issue on my site with custom post types. BUT, I have some caveats….it’s ONLY on new posts I create and only on one certain page where I list all my posts. Breadcrumbs work perfectly when I display the individual post, even on the new ones. I have a sneaky suspicion there is a bug on this one particular page and the WP_Post object is not getting cast properly (hence the error about it not being a WP_Post object, which it clearly is.) I didn’t write the code on the page with the problem – it was part of a package I purchased – so I’ll need to debug it. As soon as I figure out what’s going on I’ll post the results and hopefully it may help others. Since it worked in earlier versions, there might have been some sloppy code floating around that a lot of people found on google and used that now won’t work in the newer, cleaner versions of Breadcrumb. But that still doesn’t explain why only new posts don’t work on this one page.

Got it figured out. I have a shortcode function that creates a list of CPT posts. This code executes prior to the template page that actually displays the content. The content is “queued up” using the PHP “ob_start” and finishes with “ob_end_clean”, then this content is passed on to the page. This function gets its list of CPT posts using a WP_Query, so the $POST gets used during this process.

In the page that displays the list CPT posts, I had the breadcrumb statement “bcn_display()” BEFORE I executed the “the_post()” function, so breadcrumb was trying to use the LAST CPT post from the shortcode function instead of the WP_Post object of my page. Once I moved my breadcrumb command AFTER “the_post”, then it had the correct WP_POST object and fixed the issue. Here is how it looked before and after:

BEFORE:

<?php
	get_header();
?>
	<div class="breadcrumb-wrap"><?php bcn_display();?></div>
<?php
	if ( have_posts() ) {
		while ( have_posts() ) {
			the_post();

AFTER:

<?php
	get_header();

	if ( have_posts() ) {
		while ( have_posts() ) {
			the_post();
?>
	<div class="breadcrumb-wrap"><?php bcn_display();?></div>

So if you are running queries prior to displaying the results, make sure you have your page WP_Post before calling breadcrumb.