Array Check in post-template.php start_el function

[tripgrass]

I am receiving error "Warning: in_array() expects parameter 2 to be array, null given in /nas/wp/www/cluster-1790/trbf/wp-includes/post-template.php on line 1299"

Line 1299 :

if ( in_array( $page->ID, $_current_page->ancestors ) ) {

$current_page can be set on line 1062 of post-template.php as an Integer
Seems like line 1299 should check if $_current_page->ancestors exists and is_array

[5um17]

Duplicate of #26901.

It has been fixed.