diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index e4815ec714..fe17e2f043 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -1191,6 +1191,7 @@ function comments_open( $post_id = null ) {
 
 	$_post = get_post($post_id);
 
+	$post_id = $_post ? $_post->ID : 0;
 	$open = ( 'open' == $_post->comment_status );
 
 	/**
@@ -1198,8 +1199,8 @@ function comments_open( $post_id = null ) {
 	 *
 	 * @since 2.5.0
 	 *
-	 * @param bool        $open    Whether the current post is open for comments.
-	 * @param int|WP_Post $post_id The post ID or WP_Post object.
+	 * @param bool $open    Whether the current post is open for comments.
+	 * @param int  $post_id The post ID.
 	 */
 	return apply_filters( 'comments_open', $open, $post_id );
 }
@@ -1216,6 +1217,7 @@ function pings_open( $post_id = null ) {
 
 	$_post = get_post($post_id);
 
+	$post_id = $_post ? $_post->ID : 0;
 	$open = ( 'open' == $_post->ping_status );
 
 	/**
@@ -1223,8 +1225,8 @@ function pings_open( $post_id = null ) {
 	 *
 	 * @since 2.5.0
 	 *
-	 * @param bool        $open    Whether the current post is open for pings.
-	 * @param int|WP_Post $post_id The post ID or WP_Post object.
+	 * @param bool $open    Whether the current post is open for pings.
+	 * @param int  $post_id The post ID.
 	 */
 	return apply_filters( 'pings_open', $open, $post_id );
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c25834cc33..d5912d513c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-beta1-40665';
+$wp_version = '4.8-beta1-40666';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.