Ticket #36208: 36208.4.diff

src/wp-admin/includes/class-wp-comments-list-table.php

@@ -538 +538 @@
         }
 
         /**
+         * @since 5.4.0 Do not display comments for post types that are no longer registered.
+         *
          * @global WP_Post    $post    Global post object.
          * @global WP_Comment $comment Global comment object.
          *
@@ -557 +559 @@
                 if ( $comment->comment_post_ID > 0 ) {
                         $post = get_post( $comment->comment_post_ID );
                 }
+
+                // Check if post type exists or not
+                $post_type_object = get_post_type_object( $post->post_type );
+
+                // Early exit, if the post type doesn't exists.
+                if ( null === $post_type_object ) {
+                        return;
+                }
+
                 $this->user_can = current_user_can( 'edit_comment', $comment->comment_ID );
 
                 echo "<tr id='comment-$comment->comment_ID' class='$the_comment_class'>";