diff --git a/includes/utilities.php b/includes/utilities.php
index f3e5a30..9d2fef5 100644
--- a/includes/utilities.php
+++ b/includes/utilities.php
@@ -203,9 +203,10 @@ function build_page_chapter_index($blocks)
 			}
 		}
 		if ($block['blockName'] == 'homegrade-content-blocks/post-content-container') {
+			if ($block || $block['attrs'] || $block['attrs']['relatedPostId'] == 0) continue;
 			$shortTitle = get_field('short_title', $block['attrs']['relatedPostId']);
 
-			$anchor = !empty($block['attrs']['anchor']) ? esc_html($block['attrs']['anchor']) : "post-content-container-" .  $block['attrs']['relatedPostId'];
+			$anchor = $block['attrs'] && !empty($block['attrs']['anchor']) ? esc_html($block['attrs']['anchor']) : "post-content-container-" .  $block['attrs']['relatedPostId'];
 			array_push($chapterBlockIndex, [
 				'block-type' =>  $block['blockName'],
 				'anchor' => 	"#" . $anchor,