diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index 5de9531322..c62a920839 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -1904,7 +1904,7 @@ function wp_update_comment($commentarr) {
 	}
 
 	// Make sure that the comment post ID is valid (if specified).
-	if ( isset( $commentarr['comment_post_ID'] ) && ! get_post( $commentarr['comment_post_ID'] ) ) {
+	if ( ! empty( $commentarr['comment_post_ID'] ) && ! get_post( $commentarr['comment_post_ID'] ) ) {
 		return 0;
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5208cd99b8..2cda9ff955 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-35850';
+$wp_version = '4.5-alpha-35853';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.