Some debug problems (blog page, style.php)

[infokurs]

Corresponds also to reported debug notice https://wordpress.org/support/topic/debug-0-9-49/

1. PHP Notice: Trying to get property of non-object in /var/www/public/defiant-bat/wp-content/plugins/accelerated-mobile-pages/accelerated-moblie-pages.php on line 39

Source:
// Frontpage and Blog page check from reading settings. function ampforwp_name_blog_page() { $page_for_posts = get_option( 'page_for_posts' ); $post = get_post($page_for_posts); $slug = $post->post_name; return $slug; } function ampforwp_custom_post_page() { $front_page_type = get_option( 'show_on_front' ); return $front_page_type; }
and
// For Homepage with Pagination if ( ampforwp_custom_post_page() && ampforwp_name_blog_page() ) { add_rewrite_rule( ampforwp_name_blog_page(). '/amp/page/([0-9]{1,})/?$', 'index.php?amp&paged=$matches[1]', 'top' ); }

Is a small logic problem.
Blog page is optional and is used only in one case - Reading Settings, Front page displays >> A static page (select below) + selected Posts page.
reference: https://developer.wordpress.org/reference/functions/is_home/#usage

Else ...page_for_posts return 0, well get_post() not return valid post object ...and push notice on trying read slug.

Try something like:
// Blog page check from reading settings. function ampforwp_name_blog_page() { $page_for_posts = get_option( 'page_for_posts' ); if( ampforwp_custom_post_page() == 'page' && $page_for_posts != 0 ) { $post = get_post($page_for_posts); $slug = $post->post_name; return $slug; } return false; } function ampforwp_custom_post_page() { $front_page_type = get_option( 'show_on_front' ); return $front_page_type; }
and
// For Blog page with Pagination if ( ampforwp_name_blog_page() ) { add_rewrite_rule( ampforwp_name_blog_page(). '/amp/page/([0-9]{1,})/?$', 'index.php?amp&paged=$matches[1]', 'top' ); }

2. [12-May-2017 19:40:45 UTC] PHP Notice: Undefined variable: post_id in /var/www/public/defiant-bat/wp-content/plugins/accelerated-mobile-pages/templates/design-manager/design-2/style.php on line 10

style.php in all designs contain: $get_customizer = new AMP_Post_Template( $post_id );
...and $post_id is from ???