check if post exists before querying it to replace cover image

Author: Moggach

web/app/themes/platformlondon/functions.php

@@ -306,7 +306,7 @@
         !wp_is_json_request()
     ) {
         global $post;
-        if ($post->post_name === "projects") {
+        if ($post && isset($post->post_name) && $post->post_name === "projects") {
             preg_match('#<img.*src="([^"]*)"#', $block_content, $matches);
             if (count($matches) !== 2) {
                 return $block_content;