Insert page with breadcrumb

Since you’re hooking into loop_start, that breadcrumb will get printed every time there’s a loop. Insert Pages uses a loop to insert a page.

It’s probably better to call yoast_breadcrumb() from within your theme’s template files instead of hooking into loop_start. But if you don’t want to change that code, I think you can use a global variable to detect when you’re in an Insert Pages loop as opposed to any other loop.

Here’s a quick example (might include errors):

function your_theme_init() {
  add_filter( 'insert_pages_apply_nesting_check', function ( $should_apply ) { global $in_insertpages_loop; $in_insertpages_loop = true; return $should_apply; } );
}
add_action( 'init', 'your_theme_init' );

function wordpress_seo_plugins_breadcrumbs() {
  global $in_insertpages_loop;
  if ( function_exists( 'yoast_breadcrumb' ) && ! $in_insertpages_loop ) {
    yoast_breadcrumb( '<p id="breadcrumbs">', '</p>' );
  }
  $in_insertpages_loop = false;
}

thanks but the code doesn’t work. i have inserted below the header as you suggested and fixed the issue.