in_array() expects parameter 2 to be array, null given (nav-menu-template.php)

  • I have the following error message displayed right before my menu is rendered but ONLY on custom-post-type archive pages:

    Warning: in_array() expects parameter 2 to be array, null given in […]wp-includes/nav-menu-template.php on line 440

    Line 440 of nav-menu-template.php is (the part causing the error at least)
    in_array( $parent_item->object_id, $queried_object->ancestors )

    Like I say, this doesn’t affect ordinary posts and didn’t affect custom post types either until I created a custom post type archive page for them.

    Can anyone help? Thanks ??

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